Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net earnings	$ 158.0	$ 137.7	$ 398.4	$ 329.1
Other comprehensive (loss) income:
Foreign currency translation adjustments	(19.8)	46.0	(112.4)	180.1
Translation adjustments on net investment hedge, net of income taxes of $1.7, $(9.3), $7.5 and $(31.0), respectively	5.6	(16.5)	25.7	(55.2)
Translation adjustments of long-term intercompany loans	(3.2)	3.3	(3.3)	5.6
Unrealized gain on investments, net of income taxes of $0.2 and $0.8, respectively, for 2017	0.0	0.9	0.0	3.9
Reclassification of unrealized cumulative gain on investments, net of income taxes of $(3.4), included in retained earnings as of January 1, 2018 upon adoption of new accounting guidance on financial instruments (See Note 12 to the Consolidated Financial Statements)	0.0	0.0	(15.3)	0.0
Defined benefit pension plans and retiree health care plan, net of income taxes of $0.0, $0.1, $0.1 and $0.3, respectively	0.1	0.4	0.3	1.1
Total other comprehensive (loss) income	(17.3)	34.1	(105.0)	135.5
Comprehensive income	$ 140.7	$ 171.8	$ 293.4	$ 464.6