Contract Assets and Contract Liabilities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Contract Assets
Balance at beginning of year	$ 623.4	$ 345.6
Acquisitions	4.1	238.7
Recognized in current year	293.0	188.3
Reclassified to accounts receivable	(282.9)	(197.0)
Foreign currency impact	(8.3)	(0.8)
Balance at end of period	629.3	574.8
Contract Liabilities
Balance at beginning of year	799.7	444.8
Acquisitions	6.9	274.1
Recognized in current year	290.2	205.3
Amounts in beginning balance reclassified to revenue	(317.6)	(204.4)
Current year amounts reclassified to revenue	(11.8)	(6.4)
Foreign currency impact	(6.2)	(0.4)
Balance at end of period	$ 761.2	$ 713.0