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Contract Liabilities and Assets (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Disaggregation of Revenue [Abstract]      
Contract liability $ 160.7 $ 160.7 $ 149.6
Contract liability, revenue recognized 6.2 12.1  
Contract asset $ 8.9 $ 8.9 $ 9.2