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VALUATION AND QUALIFYING ACCOUNTS SCHEDULE II (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Allowance for Doubtful Accounts      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period $ 22.4 $ 23.3 $ 19.5
Additions - Charges to Costs and Expenses 10.4 4.6 6.9
Additions - Charged to Other Accounts 0.0 0.0 0.0
Deductions (5.4) (5.5) (3.1)
Balance at End of Period 27.4 22.4 23.3
Valuation Allowance of Deferred Tax Assets      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 45.2 24.2 21.7
Additions - Charges to Costs and Expenses 9.9 20.2 4.6
Additions - Charged to Other Accounts 0.0 0.8 0.0
Deductions 0.0 0.0 (2.1)
Balance at End of Period $ 55.1 $ 45.2 $ 24.2