Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net earnings	$ 859.1	$ 790.9	$ 751.9
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments (net of tax of $0.0 in 2020, 2019, 2018)	17.2	6.4	(19.7)
Comprehensive income	$ 876.3	$ 797.3	$ 732.2