Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 234.4	$ 186.5	$ 1,095.9	$ 362.2
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	62.4	(5.7)	304.3	(21.5)
Unrecognized pension and other postretirement costs	(0.1)	7.4	(1.5)	23.2
Derivative financial instruments	(8.9)	(1.5)	(29.6)	(48.9)
Total other comprehensive income (loss), net of tax	53.4	0.2	273.2	(47.2)
Comprehensive income	$ 287.8	$ 186.7	$ 1,369.1	$ 315.0