Fair Value Measurements - Changes in Fair Value of Level 3 Assets and Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Other Assets and Liabilities
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	General and administrative
Fair Value, Recurring
Other Assets and Liabilities
Beginning Balance	$ 125.2	$ 100.9	$ 7.3
Additions	90.0		75.5
Interest	36.1	27.6	17.9
Payments	(2.9)	(2.7)	(1.7)
Included in earnings (loss) and other comprehensive loss	6.1	(0.6)	1.9
Ending Balance	$ 254.5	$ 125.2	$ 100.9