Preparation of Interim Financial Statements: Revisions to Previously Issued Financial Statements and Disclosures (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net property, plant and equipment	$ 3,652.7	$ 3,620.8
Operating lease right-of-use assets	$ 3,959.7	$ 4,018.0
Accounting Standards Update 2016-02 [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net property, plant and equipment				$ 1,300.0
Operating Lease, Liability				700.0
Deferred Income Tax Liabilities, Net				300.0
Operating leases [Member] \| Accounting Standards Update 2016-02 [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets				3,900.0
Revision of Prior Period, Error Correction, Adjustment [Member] \| Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net property, plant and equipment			$ 33.8
Deferred Income Tax Liabilities, Net			8.5
Revision of Prior Period, Accounting Standards Update, Adjustment [Member] \| Adoption of ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest				3,013.0
Accumulated Deficit \| Revision of Prior Period, Error Correction, Adjustment [Member] \| Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest			$ 25.3
Accumulated Deficit \| Previously Reported [Member] \| Adoption of ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest				3,038.3
Accumulated Deficit \| Revision of Prior Period, Accounting Standards Update, Adjustment [Member] \| Adoption of ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest				$ 3,013.0

WINDSTREAM HOLDINGS, INC. 10-Q