Accumulated Other Comprehensive Loss Reclassifications Out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net sales	$ 854.2	$ 907.4	$ 908.8	$ 834.8	$ 829.7	$ 877.0	$ 874.0	$ 809.7	$ 3,505.2	$ 3,390.4	$ 3,359.4
Cost of goods sold	$ 595.6	$ 618.7	$ 615.3	$ 574.9	$ 562.8	$ 587.0	$ 590.9	$ 557.9	2,404.5	2,298.6	2,250.4
Total before tax									430.4	418.6	485.5
Tax (expense) benefit									(132.6)	(136.5)	(158.3)
Accumulated Other Comprehensive Income (Loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
(Loss) gain net of tax									(8.2)	(6.7)	(1.4)
Cash Flow Hedge (Loss) Gain
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
(Loss) gain net of tax									0.0	0.3	0.7
Pension and Post Retirement Benefit Plan Adjustment
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from accumulated other comprehensive income, before tax									(13.0)	(11.2)
Tax benefit (expense)									4.8	4.2
(Loss) gain net of tax									(8.2)	(7.0)	$ (2.1)
Prior-service costs
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from accumulated other comprehensive income, before tax									0.9	0.8
Actuarial gains/(losses)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from accumulated other comprehensive income, before tax									(13.9)	(12.0)
Forward Contracts | Cash Flow Hedge (Loss) Gain | Reclassification out of accumulated other comprehensive income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net sales									(0.3)	0.0
Cost of goods sold									0.3	0.4
Total before tax									0.0	0.4
Tax (expense) benefit									0.0	(0.1)
Gain (loss) net of tax									$ 0.0	$ 0.3