Segments - Schedule of Reconciliation of Segment Contribution Margin to Consolidated Net Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting Information [Line Items]
Depreciation and amortization	$ (202.3)	$ (79.3)	$ (361.7)	$ (234.9)
Gain on sale of operating assets	0.0	0.0	0.0	19.0
Transaction related and other costs	(157.7)	(14.4)	(179.0)	(31.1)
Corporate/shared operating expenses	(765.2)	(154.9)	(1,069.2)	(434.2)
Amortization of non-cash rights-of-use assets	(0.3)	(0.8)	(2.0)	(2.5)
Severance costs	0.0	(0.1)	0.0	(1.6)
Stock-based compensation	(10.1)	(3.4)	(17.4)	(10.1)
Other (expense) income, net	(0.2)	0.0	(1.3)	0.3
Gain on settlement of preexisting relationships	1,685.4	0.0	1,685.4	0.0
Interest expense, net	(168.2)	(131.0)	(467.0)	(381.7)
Income tax benefit	134.5	5.9	145.2	13.8
Net income	1,608.9	12.2	1,610.4	71.8
Operating Segments
Segment Reporting Information [Line Items]
Total segment contribution margin	385.3	249.9	896.6	745.2
Corporate/shared operating expenses	(32.3)	0.0	(32.3)	0.0
Corporate/shared operating expenses
Segment Reporting Information [Line Items]
Corporate/shared operating expenses	$ (57.5)	$ (14.6)	$ (88.4)	$ (44.6)