FAIR VALUE MEASUREMENTS AND THE FAIR VALUE OPTION - Interest Rate Swaps and Fair Value of Financial Instruments, Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest expense	$ 220.8	$ 192.4	$ 201.9
Principal co-investments	199.5	271.1	78.3
Estimate of Fair Value Measurement | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, fair value	5,000.0	5,500.0
Reported Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt carrying value	5,600.0	5,100.0
Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized currency derivative contract gain (loss)	(5.6)	(3.2)	$ 5.3
Principal co-investments	16.9
Interest Rate Swap | Designated as Hedging Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain on Derivative Instruments, Pretax	$ 42.4	0.8
Interest Rate Swap | Foreign Currency Derivative Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized currency derivative contract gain (loss)		$ 4.2