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Debt (Schedule of Original Issue Discount) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
(Original Issue Discount) [Abstract]      
Unamortized discount, beginning balance $ 1.4 $ 1.8  
Amortization of debt discount (0.4) (0.4) $ (0.4)
Unamortized discount, ending balance $ 1.0 $ 1.4 $ 1.8