Fair Value Disclosure Fair Value Disclosure - Other Financial Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Fair Value Disclosure	$ 8,352.0	$ 7,861.2
Recourse Debt	8,653.1	8,215.3
Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Recourse Fixed Rate Debt Fair Value Disclosure	8,028.8	7,609.5
Recourse Floating Rate Debt Fair Value Disclosure	624.3	605.8
Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Recourse Fixed Rate Debt Fair Value Disclosure	7,717.5	7,243.9
Recourse Floating Rate Debt Fair Value Disclosure	$ 634.5	$ 617.3

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

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+ Details