Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance, Foreign Currency Translation Gain (Loss)	$ (103.7)	$ (77.7)	$ (21.9)
Change in Foreign Currency Translation Gain (Loss)	93.2	(26.0)	(55.8)
Foreign currency translation gain loss before reclassification adjustment into earnings	0.0	0.0	0.0
Foreign Currency Translation Gain (Loss), Income tax effect	0.0	0.0	0.0
Ending Balance, Foreign Currency Translation Gain (Loss)	(10.5)	(103.7)	(77.7)
Beginning Balance, Unrealized Gain (Loss) on Securities	0.0	(0.3)	0.3
Change in Unrealized Gain (Loss) on Securities	0.0	2.5	(1.0)
Unrealized Gain (Loss) on Securities, Reclassification adjustments into earnings	0.0	(1.9)	0.0
Unrealized Gain (Loss) on Securities, Income tax effect	0.0	(0.3)	0.4
Ending Balance, Unrealized Gain (Loss) on Securities	0.0	0.0	(0.3)
Beginning Balance, Unrealized Loss on Derivative Instruments	(20.3)	(20.9)	(19.1)
Change in Unrealized Loss on Derivative Instruments	(39.6)	7.3	1.6
Unrealized Loss on Derivative Instruments, Reclassification adjustments into earnings	45.8	(3.9)	(1.0)
Unrealized Loss on Derivative Instruments, Income tax effect	(1.4)	(2.8)	(2.4)
Ending Balance, Unrealized Loss on Derivative Instruments	(15.5)	(20.3)	(20.9)
Beginning Balance, Post-Retirement Benefit Plans	(87.1)	(99.9)	(107.7)
Change in Post-Retirement Benefit Plans	(3.2)	11.7	(0.9)
Post-Retirement Benefit Plans, Reclassification adjustments into earnings	8.8	9.0	13.5
Post-Retirement Benefit Plans, Income tax effect	(2.1)	(7.9)	(4.8)
Ending Balance, Post-Retirement Benefit Plans	(83.6)	(87.1)	(99.9)
Other Comprehensive Income Change in Component	50.4	(4.5)	(56.1)
Reclassification adjustments into earnings, Total	54.6	3.2	12.5
Income tax effect, Total	(3.5)	(11.0)	(6.8)
Accumulated other comprehensive income (loss), net of tax	$ (109.6)	$ (211.1)	$ (198.8)	$ (148.4)