FAIR VALUE MEASUREMENTS - Schedule of Debt (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025
Carrying Amount | Publicly traded debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	$ 9,323.1	$ 9,670.7	$ 8,977.7
Carrying Amount | Non-publicly traded debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	0.1	0.1	0.2
Fair Value | Publicly traded debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	8,344.1	8,813.7	8,000.1
Fair Value | Non-publicly traded debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	$ 0.1	$ 0.1	$ 0.2