Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net earnings	$ 221.5	$ 213.5	$ 663.0	$ 612.2
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments (net of tax of $0.0 in 2020 and 2019)	11.1	(9.6)	(3.4)	(4.2)
Comprehensive income	$ 232.6	$ 203.9	$ 659.6	$ 608.0