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Debt (Schedule of Original Issue Discount) (Details)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Changes In Original Issue Discount [Roll Forward]  
Balance at December 31, 2018 $ 1.0
Loss on debt extinguishment from February 10, 2017 debt financing arrangement (1.0)
Amortization of original issue discount (0.4)
Balance at March 31, 2019 14.6
Financing Arrangement, January 2019  
Changes In Original Issue Discount [Roll Forward]  
Original issue discount from January 31, 2019 debt financing arrangement $ 15.0