Variable Interest Entities (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Noncontrolling Interest [Line Items]
Cash and cash equivalents	$ 743.0	$ 401.6
Other assets	400.5	303.1
Total Assets	17,999.5	12,296.5	$ 11,326.0
Accounts payable and accrued expenses	318.4	217.1
Recourse debt	12,451.7	8,215.3
Deferred income taxes	1,195.7	1,127.3
Other liabilities	162.1	107.5
Total Liabilities	14,364.4	9,857.6
GABX
Noncontrolling Interest [Line Items]
Cash and cash equivalents	32.2	0.0
Restricted cash	4,211.1	0.0
Other assets	30.6	0.0
Total Assets	4,273.9	0.0
Accounts payable and accrued expenses	46.8	0.0
Recourse debt	2,942.9	0.0
Other liabilities	20.4	0.0
Total Liabilities	$ 3,010.1	$ 0.0