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Contract Assets and Contract Liabilities (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Contract Assets    
Balance at beginning of year $ 623.4 $ 345.6
Acquisitions 4.1 217.4
Recognized in current year 759.2 445.1
Reclassified to accounts receivable (868.7) (415.7)
Foreign currency impact (0.7) (12.7)
Balance at end of period 517.3 579.7
Contract Liabilities    
Balance at beginning of year 799.7 444.8
Acquisitions 6.9 314.7
Recognized in current year 589.1 781.3
Amounts in beginning balance reclassified to revenue (430.0) (412.9)
Current year amounts reclassified to revenue (152.6) (270.3)
Foreign currency impact (3.3) (12.3)
Balance at end of period $ 809.8 $ 845.3