Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (6,917.9)	$ 2,748.8	$ 527.8
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(173.8)	289.1	(196.2)
Unrecognized pension and postretirement costs	41.9	14.5	22.3
Derivative financial instruments	44.8	(21.9)	(37.1)
Total other comprehensive income (loss), net of tax	(87.1)	281.7	(211.0)
Comprehensive income (loss)	$ (7,005.0)	$ 3,030.5	$ 316.8