Other - Net, Expense (Income) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Nonoperating Income (Expense) [Abstract]
Interest Expense		$ 225.0	$ 185.2	$ 161.2
Interest income		(167.3)	(108.7)	(87.0)
Venezuela charge	$ 203.9	0.0	203.9	0.0
Debt extinguishment loss (Note 10)		0.0	0.0	166.7
Other income		(110.1)	(195.6)	(341.5)
Other–net, (income) expense		$ (52.4)	$ 84.8	$ (100.6)