Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net earnings	$ 243.5	$ 221.5	$ 693.8	$ 663.0
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments (net of tax of $0.0 in 2021 and 2020)	(10.8)	11.1	(8.4)	(3.4)
Comprehensive income	$ 232.7	$ 232.6	$ 685.4	$ 659.6