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SUPPLEMENTAL CASH FLOW INFORMATION - RECONCILIATION OF CASH, CASH EQUIVALENTS, AND RESTRICTED CASH (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Dec. 31, 2023
Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract]        
Cash and cash equivalents $ 51.1 $ 9.8    
Restricted cash included in other current assets 32.4 5.3    
Restricted cash included in other long-term assets 34.2 27.1    
Cash, cash equivalents, and restricted cash $ 117.7 $ 42.2 $ 361.0 $ 165.2