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INVESTMENTS - Summary Financial Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Investments      
Current assets $ 947.2 $ 1,203.1  
Total assets 8,247.5 9,009.2  
Current liabilities 1,744.8 1,632.4  
Total liabilities 10,008.0 10,857.1  
Stockholders' deficit (1,760.5) (1,847.9)  
Liabilities and stockholders' deficit 8,247.5 9,009.2  
The Company's recorded investment 53.6 56.4  
Revenues 4,637.2 4,812.6 $ 3,911.4
Operating costs and expenses 4,716.5 4,886.9 4,433.7
Investments in Non-Consolidated Affiliates      
Investments      
The Company's recorded investment 53.6 56.4  
Equity Method Investment, Nonconsolidated Investee(s)      
Investments      
Current assets 230.8 263.8  
Noncurrent assets 199.0 224.7  
Total assets 429.8 488.5  
Current liabilities 280.4 130.9  
Noncurrent liabilities 231.5 385.0  
Total liabilities 511.9 515.9  
Stockholders' deficit (82.1) (27.4)  
Liabilities and stockholders' deficit 429.8 488.5  
Revenues 473.5 425.6 412.8
Operating costs and expenses 489.9 449.9 498.2
Net loss $ (16.4) $ (24.3) $ (85.4)