Condensed Consolidated Statements Of Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]
Foreign currency translation adjustments, tax (expense) benefit	$ (3.2)	$ 0.0	$ (3.9)	$ 0.0
Net unrealized gains (losses) on available-for-sale securities, tax (expense) benefit	0.0	0.0	0.0	0.0
Net gains (losses) on hedging instruments, tax (expense) benefit	(18.7)	(13.3)	(37.3)	(20.9)
Net pensions and other post-retirement benefits, tax (expense) benefit	$ 0.2	$ 4.4	$ 0.4	$ 4.5