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Debt (Schedule of Debt Issuance Costs) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Issuance Costs [Roll Forward]      
Debt issuance costs, beginning balance $ 10.3 $ 11.3  
Payments of debt issuance costs 0.0 4.7 $ 0.1
Write off of debt issuance costs     (1.0)
Amortization of debt issuance costs (3.1) (3.1) (3.8)
Debt issuance costs, ending balance $ 7.2 10.3 $ 11.3
Financing Arrangement, February 2017      
Debt Issuance Costs [Roll Forward]      
Payments of debt issuance costs   3.2  
Financing Agreement, April 2014      
Debt Issuance Costs [Roll Forward]      
Write off of debt issuance costs   $ (1.1)