Fair Value of Financial Instruments - Schedule of Fair Value (Details) - Fair Value, Inputs, Level 2 - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Not Recorded at Fair Value in the Financial Statements:
Settlement payable	$ 0.0	$ 71.7
Notes and other debt	9,338.2	5,879.2
Reported Value Measurement
Not Recorded at Fair Value in the Financial Statements:
Notes and other debt	9,369.8	5,868.7
Interest rate cap:
Recorded at Fair Value in the Financial Statements:
Interest rate cap assets	0.0	0.1
Interest rate swap:
Recorded at Fair Value in the Financial Statements:
Interest rate swap liabilities	$ 6.5	$ 0.0