Condensed Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net earnings	$ 234.4	$ 277.5	$ 693.9	$ 896.8
Other comprehensive income, net of tax:
Foreign currency translation adjustments	43.4	(41.9)	(28.6)	(41.8)
Total other comprehensive income (loss), net of tax	43.4	(41.9)	(28.6)	(41.8)
Comprehensive income	$ 277.8	$ 235.6	$ 665.3	$ 855.0