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Basis of Presentation, New Accounting Standards and Significant Accounting Policies (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative transition adjustment to retained earnings	$ 1,912.9	$ 1,893.9	$ 1,831.6	$ 1,738.0
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative transition adjustment to retained earnings	$ 1,836.7	1,761.3	$ 1,606.1	$ 1,492.8
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative transition adjustment to retained earnings		(11.1)
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative transition adjustment to retained earnings		$ (11.1)

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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