Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net earnings	$ 194.1	$ 174.3
Other comprehensive income, net of tax:
Foreign currency translation adjustments (net of tax of $0.00 in 2019 and 2018)	3.7	2.0
Comprehensive income	$ 197.8	$ 176.3