Long-Term Debt - Additional Information - Credit Agreement Refinancing and International Notes Redemption (Details) - USD ($)					4 Months Ended	8 Months Ended	12 Months Ended		20 Months Ended
	Nov. 14, 2018	Jun. 09, 2017	May 10, 2017	Nov. 09, 2015	May 10, 2017	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	May 10, 2018	May 04, 2018	Nov. 30, 2017	May 20, 2014
Debt Instrument [Line Items]
Sub-limits for letter of credit and swingline commitments												$ 20,000,000
Aggregate principal amount			$ 532,600,000		$ 532,600,000
Gain (loss) on extinguishment of debt							$ (32,000,000)	$ 3,500,000
Transaction fees and expenses						$ 25,700,000	14,900,000	25,700,000	$ 14,900,000
Letters Of Credit Outstanding Amount							$ 6,500,000		6,500,000
Credit Agreement Refinancing and International Notes Redemption
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt								5,300,000
Unamortized troubled debt restructuring carrying value								21,000,000
Write off of deferred debt issuance cost								6,300,000
Prepayment premium incurred								9,400,000
7.5 % Cash/PIK senior notes due 2018 \| Affinion International
Debt Instrument [Line Items]
Principal amount of notes outstanding			$ 118,500,000		$ 118,500,000
Aggregate principal amount of notes, repurchased		$ 118,500,000
Stated interest rate on notes			7.50%	7.50%	7.50%
Debt Instrument, Redemption Price, Percentage		100.00%
Debt instrument, redemption period, start date							May 10, 2017
Debt instrument, redemption period, end date							Jun. 09, 2017
Aggregate principal amount				$ 110,000,000
Cash interest percentage				3.50%
PIK interest percentage				4.00%
Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility maximum borrowing capacity							$ 110,000,000		$ 110,000,000
Revolving Credit Facility \| Affinion Benefits Group, LLC
Debt Instrument [Line Items]
Line of credit facility maximum borrowing capacity	$ 110,000,000
Line of credit facility total secured leverage ratio	527.50%
Percentage for prepayment of term loans	103.00%
Percentage of increase general call protection upon fourth anniversary of closing facility	2.00%
Period for remaining proceeds used to prepay term loans	9 months
Revolving Credit Facility \| Affinion Benefits Group, LLC \| Through March 31, 2020
Debt Instrument [Line Items]
Quarterly amortization payments	0.25%
Revolving Credit Facility \| Affinion Benefits Group, LLC \| Through March 31, 2021
Debt Instrument [Line Items]
Quarterly amortization payments	0.625%
Revolving Credit Facility \| Affinion Benefits Group, LLC \| Thereafter March 31, 2021
Debt Instrument [Line Items]
Quarterly amortization payments	1.25%
Revolving Credit Facility \| Affinion Benefits Group, LLC \| Maximum
Debt Instrument [Line Items]
Proceeds from sale to be retained	$ 50,000,000
2017 Credit Facility
Debt Instrument [Line Items]
Line of credit facility expiration period			5 years
Maximum required ratio for consolidated fixed charges									6.50%
Minimum required ratio for consolidated fixed charges									1.10%
Immediate release from proceeds from sale of business	45,000,000
Proceeds from ABG sale	50,000,000
Working capital expenditure	32,000,000
Prepayment of outstanding term loans	$ 13,000,000
Percentage of prepayment premium	3.00%
Repayment of principal amount of term loans	$ 31,000,000
Debt Instruments, unamortized discount							$ 36,300,000		$ 36,300,000
2017 Credit Facility \| Minimum
Debt Instrument [Line Items]
Percentage of prepayment premium	3.00%
2017 Credit Facility \| Option Two
Debt Instrument [Line Items]
Interest margin of loans			6.75%
2017 Credit Facility \| LIBOR Loans
Debt Instrument [Line Items]
Interest rate under line of credit facility			1.00%
2017 Credit Facility \| LIBOR Loans \| Option One
Debt Instrument [Line Items]
Interest margin of loans			7.75%
2017 Credit Facility \| Federal Funds Effective Rate \| Option Two
Debt Instrument [Line Items]
Interest margin of loans			0.50%
2017 Credit Facility \| Alternate Base Rate
Debt Instrument [Line Items]
Interest rate under line of credit facility			2.00%
2017 Credit Facility \| Term Loan Facility
Debt Instrument [Line Items]
Aggregate principal amount on term loans			$ 1,300,000,000		$ 1,300,000,000
Term loans, quarterly amortization payments terms							The term loans provide for quarterly amortization payments totaling (i) for the first two years after May 10, 2017, 1% per annum, (ii) for the third year after May 10, 2017, 2.5% per annum, and (iii) for each year thereafter, 5% per annum, in each case, payable quarterly, with the balance due upon the final maturity date, subject in each case, to reduction of such amortization payments for certain prepayments. The 2017 Credit Facility also requires mandatory prepayments of the outstanding term loans based on excess cash flow (as defined in the 2017 Credit Facility), if any, and the proceeds from certain specified transactions.
Quarterly amortization payments in year one			1.00%		1.00%
Quarterly amortization payments in year two			1.00%		1.00%
Quarterly amortization payments in year three			2.50%		2.50%
Quarterly amortization payments in after year three			5.00%		5.00%
Debt instrument, frequency of periodic payment							Quarterly
Transaction fees and expenses							$ 17,100,000		17,100,000
2017 Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility maximum borrowing capacity										$ 80,000,000	$ 80,000,000
Transaction fees and expenses							3,400,000		3,400,000
Outstanding borrowings						55,000,000	100,000,000	$ 55,000,000	100,000,000
Borrowings under revolving credit facility						192,200,000	289,700,000
Repayments under revolving credit facility						$ 137,200,000	244,700,000
Available for borrowings under revolving credit facility							5,000,000		5,000,000
Letters Of Credit Outstanding Amount							$ 5,000,000		$ 5,000,000
2017 Credit Facility \| Revolving Credit Facility \| Affinion Benefits Group, LLC
Debt Instrument [Line Items]
Line of credit facility maximum borrowing capacity	$ 80,000,000
2014 Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility maximum borrowing capacity													$ 80,000,000
Borrowings under revolving credit facility					$ 99,000,000
Repayments under revolving credit facility					$ 99,000,000
2014 Credit Facility \| First lien term loan due 2018
Debt Instrument [Line Items]
Aggregate principal amount on term loans													775,000,000
2014 Credit Facility \| Second lien term loan due 2018
Debt Instrument [Line Items]
Aggregate principal amount on term loans													$ 425,000,000

Affinion Group Holdings, Inc. 10-K