FAIR VALUE MEASUREMENTS - Schedule of Debt (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025	Jun. 30, 2025
Carrying Amount | Publicly traded debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	$ 9,325.7	$ 9,670.7	$ 8,979.5
Carrying Amount | Non-publicly traded debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	500.0	0.1	0.1
Fair Value | Publicly traded debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	8,421.4	8,813.7	7,994.3
Fair Value | Non-publicly traded debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	$ 485.8	$ 0.1	$ 0.1