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FAIR VALUE MEASUREMENTS - Carrying Amount and Fair Value of Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Publicly traded debt | Carrying Amount      
Debt Instrument [Line Items]      
Debt fair value $ 9,670.7 $ 9,225.8 $ 9,475.8
Publicly traded debt | Fair Value      
Debt Instrument [Line Items]      
Debt fair value 8,813.7 8,172.8 8,615.1
Non-publicly traded debt | Carrying Amount      
Debt Instrument [Line Items]      
Debt fair value 0.1 0.2 0.9
Non-publicly traded debt | Fair Value      
Debt Instrument [Line Items]      
Debt fair value $ 0.1 $ 0.2 $ 0.8