Condensed Consolidated Statements of Comprehensive Income - 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	$ 213.5	$ 197.6	$ 612.2	$ 583.1
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments (net of tax of $0.0 in 2019 and 2018)	(9.6)	(0.8)	(4.2)	(11.6)
Comprehensive income	$ 203.9	$ 196.8	$ 608.0	$ 571.5