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Debt (Schedule of Debt Issuance Costs) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Debt Issuance Costs [Roll Forward]    
Balance at December 31, 2016 $ 11.3  
Loss on debt extinguishment from April 28, 2014 debt financing arrangement (2.6) $ 14.1
Amortization of debt issuance costs (0.8)  
Balance at March 31, 2017 12.6  
Financing Arrangement, February 2017 [Member]    
Debt Issuance Costs [Roll Forward]    
Debt issuance costs from February 10, 2017 debt financing arrangement 3.2  
Financing Agreement, April 2014 [Member]    
Debt Issuance Costs [Roll Forward]    
Loss on debt extinguishment from April 28, 2014 debt financing arrangement $ (1.1)