Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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

Overview, Basis of Presentation and Recently Issued Authoritative Accounting Guidance Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2020	Jan. 31, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in retained earnings	$ (845.5)		$ (632.2)
Cumulative Effect, Period of Adoption, Adjustment \| Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses		$ 0.1
Decrease in retained earnings		$ 0.1