The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Name:	us-gaap_RetainedEarningsAccumulatedDeficit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Recent Accounting Pronouncements - Narrative (Details) - USD ($) $ in Millions	Jan. 01, 2021	Dec. 31, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings		$ (1,813.4)	$ (2,018.6)
Accounting Standards Update 2019-12 \| Forecast
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings	$ 19.0