Income Taxes - Schedule of Components of Income Tax Benefits (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Income Tax Disclosure [Abstract]
Income before income taxes	$ 1,474.4	$ 6.3	$ 1,465.2	$ 58.0
Income tax expense at U.S. statutory federal rate	309.6		307.7
Nontaxable gain on settlement of preexisting relationships	(353.9)		(353.9)
State income taxes, net of federal benefit	2.7		1.6
Benefit of REIT status for the pre-Merger period	12.4		6.0
Permanent differences	(7.5)		(7.0)
Deferred tax impact of REIT liquidation	(675.8)		(675.8)
Changes in valuation	581.7		581.7
Reversal of unrecognized tax benefit related to expiration of statute	0.0		(3.0)
Other	(3.7)		(2.5)
Total income tax benefit	$ (134.5)	$ (5.9)	$ (145.2)	$ (13.8)