Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net earnings	$ 204.6	$ 211.2	$ 398.7	$ 385.5
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments (net of tax of $0.0 in 2019 and 2018)	1.7	(12.8)	5.4	(10.8)
Comprehensive income	$ 206.3	$ 198.4	$ 404.1	$ 374.7