Strategic Acquisition and Divestiture (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	Apr. 01, 2025	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Feb. 28, 2025	Dec. 31, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Goodwill		$ 107.6		$ 107.6			$ 100.3
Receivables, less allowances for credit losses of $21.0 million at June 30, 2025, and $21.5 million at December 31, 2024		290.0		290.0			273.2
Other long-term assets		64.0		64.0			$ 78.6
Gain on the sale of an investment				0.5	$ 0.0
European Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on the sale of an investment		$ 0.0	$ 0.0	$ 0.5	$ 0.0
Disposal Group, Held-for-Sale, Not Discontinued Operations \| European Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal group, consideration						$ 24.1
Accounts receivable						19.5
Receivables, less allowances for credit losses of $21.0 million at June 30, 2025, and $21.5 million at December 31, 2024						4.3
Other long-term assets						15.2
Disposal group, cash						4.6
Disposal group, debt and finance lease						7.4
Disposal group, contingent consideration						$ 10.0
Enru
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Business combination, consideration transferred	$ 27.0
Payments to acquire businesses	16.3
Business combination, contingent consideration	8.8
Business combination, consideration transferred, deferred payment	$ 1.9
Business combination, consideration transferred, contingent consideration, term	5 years
Business combination, recognized identifiable assets acquired and liabilities assumed, property, plant, and equipment	$ 8.2
Goodwill	7.3
Business acquisition, goodwill, expected tax deductible amount	3.5
Enru \| Other Intangible Assets
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Business combination, recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles	$ 11.5
Enru \| Other Intangible Assets \| Minimum
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Acquired finite-lived intangible assets, weighted average useful life	5 years
Enru \| Other Intangible Assets \| Maximum
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Acquired finite-lived intangible assets, weighted average useful life	6 years

Quad/Graphics, Inc. 10-Q