Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other comprehensive income (loss)	$ 53.3	$ 62.1	$ (218.2)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax	24.2	20.5
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax	0.0	0.0	0.0
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net (Gain) Loss, Net of Tax	15.0	12.5	12.9
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	39.6	35.8	(215.2)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	39.6	35.8	(215.2)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax	(1.3)	13.8	(15.9)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax	(9.2)	(8.0)
Pension and other postretirement liability adjustments, net of tax	13.7	26.3	(3.0)
Accumulated other comprehensive loss, net of tax
Foreign currency translation	(291.1)	(330.7)	(366.5)	$ (151.3)
Pension and postretirement liability adjustment, net of tax effect	(103.4)	(117.1)	(143.4)	(140.4)
Tax effect of pension liability adjustment	61.6	71.2
Accumulated other comprehensive income (loss)	(394.5)	(447.8)	(509.9)	$ (291.7)
Before reclassification [Member]
Other comprehensive income (loss)	38.3	49.6	(231.1)
Reclassified [Member]
Other comprehensive income (loss)	15.0	12.5	$ 12.9
Pension Costs [Member]
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net (Gain) Loss, Net of Tax	$ 15.0	$ 12.5