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FAIR VALUE MEASUREMENTS - Nonrecurring Fair Value Measurements (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Jul. 22, 2024
Dec. 31, 2023
Fair value measurements      
Corporate borrowings, carrying value $ 4,048.4   $ 4,552.3
Significant other observable inputs (Level 2)      
Fair value measurements      
Corporate borrowings, fair value $ 3,765.9    
Nonrecurring basis | Exchangeable Notes      
Fair value measurements      
Corporate borrowings, carrying value   $ 293.6  
Nonrecurring basis | Exchangeable Notes | Significant other observable inputs (Level 2)      
Fair value measurements      
Corporate borrowings, fair value   $ 293.6