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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Shipping and Handling Costs (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Product Information [Line Items]      
Cost of sales $ 1,080.6 $ 1,114.4 $ 939.4
Shipping and Handling      
Product Information [Line Items]      
Cost of sales $ 74.0 $ 71.5 $ 70.6