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Contract Liabilities and Assets (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Dec. 31, 2018
Disaggregation of Revenue [Abstract]      
Contract liability $ 166.4 $ 166.4 $ 149.6
Contract liability, revenue recognized 6.4 18.5  
Contract asset $ 8.9 $ 8.9 $ 9.2