Fair Value Disclosure Fair Value Disclosure - Other Financial Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Recourse Debt	$ 8,215.3	$ 7,388.1
Debt Instrument, Fair Value Disclosure	7,861.2	6,977.5
Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Recourse Fixed Rate Debt Fair Value Disclosure	7,609.5	7,026.6
Recourse Floating Rate Debt Fair Value Disclosure	605.8	361.5
Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Recourse Fixed Rate Debt Fair Value Disclosure	7,243.9	6,614.6
Recourse Floating Rate Debt Fair Value Disclosure	$ 617.3	$ 362.9