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

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Recent Authoritative Accounting Guidance (Details) - USD ($) $ in Millions	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity Attributable to Parent	$ 1,959.8		$ 2,013.9
Off-Balance Sheet, Credit Loss, Liability	$ 3.7		$ 0.0
Accounting Standards Update 2016-13 \| Adjustments for New Accounting Principle, Early Adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss		$ 30.0
Off-Balance Sheet, Credit Loss, Liability		2.3
Deferred Income Tax Assets, Net		8.2
Accounting Standards Update 2016-13 \| Adjustments for New Accounting Principle, Early Adoption [Member] \| Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity Attributable to Parent		$ 24.1