Fair Value Disclosure Fair Value Disclosure - Other Financial Instruments (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Fair Value Disclosure	$ 12,038.9	$ 12,313.3
Recourse debt (1)	12,289.3	12,451.7
Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Recourse Fixed Rate Debt Fair Value Disclosure	9,616.5	8,622.5
Recourse Floating Rate Debt Fair Value Disclosure	2,672.8	3,829.2
Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Recourse Fixed Rate Debt Fair Value Disclosure	9,341.8	8,443.1
Recourse Floating Rate Debt Fair Value Disclosure	$ 2,697.1	$ 3,870.2

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

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+ Details