Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 53.3	$ 638.5
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	64.1	106.0
Unrecognized pension and postretirement costs	(16.3)	0.8
Derivative financial instruments	3.6	(10.7)
Total other comprehensive income, net of tax	51.4	96.1
Comprehensive income	$ 104.7	$ 734.6