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Revenue from Contracts with Customers - Contract Assets and Liabilities (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
Contract Assets, Current [Roll Forward]  
Balance as of January 1, 2018 $ 0.0
Recognized in current year 92.9
Reclassified to accounts receivable (95.8)
Impairment 0.0
Reclassification to/from long-term 16.8
Other 0.8
Balance as of December 31, 2018 51.2
Contract Assets, Noncurrent [Roll Forward]  
Recognized in current year 0.0
Reclassified to accounts receivable 0.0
Impairment 0.0
Reclassification to/from short-term (16.8)
Balance as of December 31, 2018 0.1
Contract Liabilities, Current [Roll Forward]  
Balance as of January 1, 2018 0.0
Recognized in current year 76.7
Amounts in beginning balance reclassified to revenue (49.6)
Current year amounts reclassified to revenue (42.7)
Other 2.7
Reclassification to/from long-term 14.6
Balance as of December 31, 2018 71.4
Contract Liabilities, Noncurrent [Roll Forward]  
Balance as of January 1, 2018 0.0
Recognized in current year 0.7
Amounts in beginning balance reclassified to revenue (1.0)
Current year amounts reclassified to revenue 0.0
Other 0.0
Reclassification to/from short-term (14.6)
Balance as of December 31, 2018 $ 7.3