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FRANCHISE RIGHTS AND OTHER INTANGIBLE ASSETS - Schedule of Goodwill and Intangible Assets (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]        
Indefinite-lived intangible assets: $ 199.7 $ 161.0 $ 199.7  
Goodwill, Impaired, Accumulated Impairment Loss [Abstract]        
Goodwill, gross 242.5 242.5 242.5  
Accumulated impairment (241.7) (241.7) (241.7)  
Goodwill, net 0.8 0.8 0.8 $ 21.1
Total indefinite-lived intangible assets 200.5 161.8 200.5  
Other intangible assets 23.8 10.9 23.8  
Less: accumulated amortization 21.0 10.8 21.0  
Definite-lived intangible assets, net 2.8 0.1 2.8  
Franchise rights and other intangible assets, net 203.3 161.9 203.3  
Franchise rights        
Indefinite-Lived Intangible Assets [Line Items]        
Impairment of indefinite-lived intangible assets $ 37.0 $ 182.0 $ 142.7