Condensed Consolidated Statements Of Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]
Foreign currency translation adjustments, tax (expense) benefit	$ (0.5)	$ (3.2)	$ (0.5)	$ (3.9)
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	12.1	(18.7)	8.9	(37.3)
Net pensions and other post-retirement benefits, tax (expense) benefit	$ (0.4)	$ 0.2	$ (0.2)	$ 0.4