Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013
Accumulated other comprehensive loss, net of tax
Foreign currency translation	$ (357.4)	$ (73.1)	$ (357.4)	$ (73.1)	$ (151.3)	$ (8.0)
Pension and other postretirement liability adjustment, net of deferred tax effect	(130.8)	(89.6)	(130.8)	(89.6)	(140.4)	(90.7)
Accumulated other comprehensive loss	(488.2)	(162.7)	(488.2)	(162.7)	(291.7)	$ (98.7)
Tax effect of pension liability adjustment	79.9		79.9		$ 85.9
Other comprehensive income, before reclassification, foreign currency translation			(206.1)	(65.1)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments, Net of Tax			0.0	(4.8)
Other comprehensive income, reclassification adjustment, foreign currency translation			0.0	0.0
Other comprehensive income, reclassification, pension	3.2	2.6	9.6	5.9
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments and Tax				7.7
Translation adjustments	(119.8)	(94.3)	(206.1)	(65.1)
Pension and other postretirement liability adjustments, net of tax	3.2	2.6	9.6	1.1
Other comprehensive income (loss)	(116.6)	(91.7)	(196.5)	(64.0)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax				(4.8)
Before reclassification [Member]
Accumulated other comprehensive loss, net of tax
Other comprehensive income (loss)			(206.1)	(69.9)
Reclassified [Member]
Accumulated other comprehensive loss, net of tax
Other comprehensive income (loss)			9.6	5.9
Pension Costs [Member]
Accumulated other comprehensive loss, net of tax
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, before Tax	5.3	4.3	15.9	12.2
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Tax	(2.1)	(1.7)	(6.3)	(4.9)
Other comprehensive income, reclassification, pension	3.2	2.6	9.6	7.3
OPEB [Member]
Accumulated other comprehensive loss, net of tax
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, before Tax	0.0	0.0	0.0	(2.2)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Tax	0.0	0.0	0.0	0.8
Other comprehensive income, reclassification, pension	$ 0.0	$ 0.0	$ 0.0	$ (1.4)