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Revenue Recognition - Schedule Of Contract Assets And Liabilities (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2018
USD ($)
Change in Contract with Customer, Asset [Roll Forward]  
Balance as of December 31, 2017 $ 5.8
Decrease due to transfer to receivables during the period (0.6)
Balance as of March 31, 2018 5.2
Change in Contract with Customer, Liability [Roll Forward]  
Balance as of December 31, 2017 123.1
Increase due to cash received 24.6
Decrease due to amortization of deferred revenue that was included in the beginning contract liability balance (24.8)
Decrease due to amortization of deferred revenue that was added during the period (2.8)
Balance as of March 31, 2018 $ 120.1