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INCOME TAXES - Components of Income from Operations before Provision for Income Taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Domestic $ 78.0 $ 117.9 $ 145.1
Foreign 479.2 328.9 222.5
Income before income taxes $ 557.2 $ 446.8 $ 367.6