Condensed Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net earnings	$ 277.5	$ 247.6	$ 896.8	$ 687.3
Other comprehensive income, net of tax:
Foreign currency translation adjustments	(41.9)	5.0	(41.8)	(13.4)
Total other comprehensive income, net of tax	(41.9)	5.0	(41.8)	(13.4)
Comprehensive income	$ 235.6	$ 252.6	$ 855.0	$ 673.9