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Fair Values - (Carrying Value and Fair Value of Financial Instruments) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Sep. 30, 2022	Aug. 31, 2022	Apr. 30, 2022	Dec. 31, 2021	Dec. 31, 2020
Carrying Value
Book and estimated fair values of financial instruments
Net investment in leases					$ 43.0
Loans receivable and other lending investments	$ 49.0				333.0
Loans receivable held for sale	38.0				43.0
Cash and cash equivalents	1,442.0				340.0
Restricted cash	6.0				54.0
Debt obligations, net	1,683.0				2,572.0
Carrying Value | Fair Value, Inputs, Level 1
Book and estimated fair values of financial instruments
Debt obligations, net	1,584.0				2,473.0
Carrying Value | Fair Value, Inputs, Level 3
Book and estimated fair values of financial instruments
Debt obligations, net	99.0				99.0
Fair Value
Book and estimated fair values of financial instruments
Net investment in leases					43.0
Loans receivable and other lending investments	46.0				345.0
Loans receivable held for sale	38.0				43.0
Cash and cash equivalents	1,442.0				340.0
Restricted cash	6.0				54.0
Debt obligations, net	1,686.0				2,903.0
Fair Value | Fair Value, Inputs, Level 1
Book and estimated fair values of financial instruments
Debt obligations, net	1,588.0				2,799.0
Fair Value | Fair Value, Inputs, Level 3
Book and estimated fair values of financial instruments
Debt obligations, net	$ 98.0				$ 104.0
3.125% Senior Convertible Notes
Book and estimated fair values of financial instruments
Stated interest rate					3.125%	3.125%
3.125% Senior Convertible Notes | Unsecured notes
Book and estimated fair values of financial instruments
Stated interest rate	3.125%	3.125%	3.125%	3.125%	3.125%	3.125%
3.125% Senior Convertible Notes | Unsecured notes | Fair Value, Inputs, Level 1
Book and estimated fair values of financial instruments
Debt obligations, net					$ 527.5

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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