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	$ 949.7	$ 1,767.9	$ 944.4
Other comprehensive income, net of tax:
Foreign currency translation adjustments	65.8	30.5	(57.1)
Total other comprehensive income/(loss), net of tax	65.8	30.5	(57.1)
Comprehensive income	$ 1,015.5	$ 1,798.4	$ 887.3