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VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Allowance for doubtful accounts      
Movement in Valuation Allowances and Reserves      
Balance at Beginning of Period $ 14.7 $ 13.6 $ 13.7
Charged to Costs and Expenses 3.1 4.7 2.2
Charged to Other Accounts 0.0 0.2 1.0
Deductions (1.4) (3.8) (3.3)
Balance at End of Period 16.4 14.7 13.6
Tax valuation allowance      
Movement in Valuation Allowances and Reserves      
Balance at Beginning of Period 64.0 44.9 41.6
Charged to Costs and Expenses 6.3 18.9 7.1
Charged to Other Accounts 0.6 0.2 (1.8)
Deductions (1.1) 0.0 (2.0)
Balance at End of Period $ 69.8 $ 64.0 $ 44.9