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INCOME TAXES - Deferred Income Taxes (Benefits) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Tax Disclosure [Abstract]      
Property and equipment $ (43.2) $ (64.1) $ 11.8
Asset impairments 0.0 4.6 2.0
Operating lease assets (6.3) 24.8 (10.6)
Operating lease liabilities 3.8 (24.3) 10.6
Stock-based compensation 1.9 (9.0) (8.1)
Accrued compensation (4.1) (0.5) (1.6)
Supplemental savings plan liability (26.4) 21.3 (29.3)
Acquisition-related retention liability (14.8) (13.6) 0.0
Contingent consideration liability 15.4 32.4 0.0
Acquired investments (19.5) (73.0) 0.0
Unrealized holding gains recognized in non-operating income 43.8 (114.6) (26.1)
Foreign net operating losses (31.5) (11.0) 0.0
Change in valuation allowance 86.4 16.4 0.0
Other 3.1 3.6 (5.0)
Total net deferred income taxes (benefits) $ 8.6 $ (207.0) $ (56.3)