Fair Value Measurements and the Fair Value Option - Interest Rate Swaps and Fair Value of Financial Instruments, Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Principal co-investments	$ 6.3	$ 39.4	$ 22.7	$ 117.6
Reported Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt fair value	5,300.0		5,300.0		$ 5,600.0
Level 2 | Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt fair value	$ 4,700.0		4,700.0		$ 5,000.0
Foreign Currency Translation
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized gains, arising during the period			$ 26.5
Foreign Currency Translation | Euro
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percentage of asset carrying values hedged (as percent)	93.00%		93.00%
Foreign Currency Translation | Gibraltar, Pounds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percentage of asset carrying values hedged (as percent)	91.00%		91.00%
Interest Rate Swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Principal co-investments			$ 1.7	3.9
Interest Rate Swaps | Designated as Hedging Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain on derivatives		$ 5.1	$ 20.5	$ 11.0