Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net earnings	$ 148.9	$ 131.5	$ 283.1	$ 257.7
Other comprehensive income, net of tax:
Foreign currency translation adjustments (net of tax of $0.0 in 2017 and 2016)	8.1	(1.5)	11.0	12.2
Comprehensive income	$ 157.0	$ 130.0	$ 294.1	$ 269.9