Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Accumulated other comprehensive loss, net of tax
Foreign currency translation	$ (322.7)	$ (250.4)	$ (366.5)	$ (151.3)
Pension and other postretirement liability adjustment, net of deferred tax effect	(140.1)	(137.2)	(143.4)	(140.4)
Accumulated other comprehensive loss	(462.8)	(387.6)	(509.9)	$ (291.7)
Tax effect of pension liability adjustment	87.6		$ 89.0
Other comprehensive income, before reclassification, foreign currency translation	43.8	(99.1)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments, Net of Tax	1.0	0.0
Other comprehensive income, reclassification adjustment, foreign currency translation	0.0	0.0
Other comprehensive income, reclassification, pension	2.3	3.2
Translation adjustments	43.8	(99.1)
Pension and other postretirement liability adjustments, net of tax	3.3	3.2
Other comprehensive income (loss)	47.1	(95.9)
Before reclassification [Member]
Accumulated other comprehensive loss, net of tax
Other comprehensive income (loss)	44.8	(99.1)
Reclassified [Member]
Accumulated other comprehensive loss, net of tax
Other comprehensive income (loss)	2.3	3.2
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	3.9	5.2
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Tax	(1.6)	(2.0)
Other comprehensive income, reclassification, pension	$ 2.3	$ 3.2