Stockholders' Equity - Reclassification out of accumulated other comprehensive income (loss) (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2018	Jun. 30, 2017
Schedule of Reclassifications out of Accumulated Comprehensive Income (Loss) [Line Items]
Cost of sales	$ (404.8)		$ (318.3)		$ (722.5)	$ (572.2)
Income (loss) from continuing operations before taxes	8.7		3.0		2.6	(31.5)
Tax expense	1.2		(2.3)		(2.7)	(3.8)
Other income (expense) - net	(5.6)		1.2		(2.9)	(0.9)
Reclassification out of Accumulated Other Comprehensive Income
Schedule of Reclassifications out of Accumulated Comprehensive Income (Loss) [Line Items]
Net of Tax	(1.1)		(0.6)		(1.7)	(1.4)
Gains and Losses on Cash Flow Hedges
Schedule of Reclassifications out of Accumulated Comprehensive Income (Loss) [Line Items]
Net of Tax	(0.3)		(0.1)	$ (0.2)
Gains and Losses on Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income
Schedule of Reclassifications out of Accumulated Comprehensive Income (Loss) [Line Items]
Income (loss) from continuing operations before taxes	(0.3)		(0.1)		(0.3)	(0.3)
Net loss	(0.3)		(0.1)		(0.3)	(0.3)
Gains and Losses on Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income | Commodity contracts
Schedule of Reclassifications out of Accumulated Comprehensive Income (Loss) [Line Items]
Cost of sales	(0.3)				(0.3)
Gains and Losses on Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income | Foreign Currency Exchange Contracts
Schedule of Reclassifications out of Accumulated Comprehensive Income (Loss) [Line Items]
Cost of sales			(0.1)			(0.3)
Prior Service Cost | Reclassification out of Accumulated Other Comprehensive Income
Schedule of Reclassifications out of Accumulated Comprehensive Income (Loss) [Line Items]
Other income (expense) - net	0.7		0.4		1.4	0.7
Actuarial Losses | Reclassification out of Accumulated Other Comprehensive Income
Schedule of Reclassifications out of Accumulated Comprehensive Income (Loss) [Line Items]
Other income (expense) - net	(1.4)		(1.3)		(2.8)	(2.6)
Pension & Postretirement
Schedule of Reclassifications out of Accumulated Comprehensive Income (Loss) [Line Items]
Net of Tax	(0.8)	$ (0.6)	(0.5)	$ (0.6)
Pension & Postretirement | Reclassification out of Accumulated Other Comprehensive Income
Schedule of Reclassifications out of Accumulated Comprehensive Income (Loss) [Line Items]
Total before tax	(0.7)		(0.9)		(1.4)	(1.9)
Tax expense (benefit)	(0.1)		0.4			0.8
Net of Tax	$ (0.8)		$ (0.5)		$ (1.4)	$ (1.1)