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Schedule II (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
SEC Schedule, 12-09, Allowance, Credit Loss [Member]      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year $ 15.9 $ 13.7 $ 10.7
Additions 2.3 3.5 3.4
Deductions (2.8) (1.3) (0.4)
Balance at End of Year 15.4 15.9 13.7
Valuation Allowance for Deferred Tax Assets [Member]      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 214.2 135.4 127.8
Additions 11.9 78.8 9.6
Deductions (67.1) 0.0 (2.0)
Balance at End of Year $ 159.0 $ 214.2 $ 135.4