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Contract Assets and Contract Liabilities (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Contract Assets    
Balance at beginning of year $ 623.4 $ 345.6
Acquisitions 4.1 213.6
Recognized in current year 451.8 324.9
Reclassified to accounts receivable (519.1) (300.7)
Foreign currency impact (6.2) (0.9)
Balance at end of period 554.0 582.5
Contract Liabilities    
Balance at beginning of year 799.7 444.8
Acquisitions 6.8 282.1
Recognized in current year 424.7 572.6
Amounts in beginning balance reclassified to revenue (333.9) (252.0)
Current year amounts reclassified to revenue (107.5) (257.6)
Foreign currency impact (12.0) (0.9)
Balance at end of period $ 777.8 $ 789.0