Accumulated Other Comprehensive (Loss) (Reclassification out of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Cost of goods sold	$ 241.0	$ 225.2	$ 676.8	$ 651.1
Net sales	351.9	334.9	998.1	936.6
Interest expense	9.1	9.0	27.5	43.4
Total (income) loss from continuing operations, before tax	(61.2)	(63.6)	(186.7)	(109.8)
Tax impact	17.7	7.7	70.9	44.4
Total (income) from discontinued operations, net of tax	(5.9)	(14.7)	(5.3)	(12.2)
Total (income) loss, net of tax	(49.4)	(70.6)	(121.1)	(77.6)
Selling, general and administrative expenses	$ 55.8	$ 55.7	162.8	165.2
Total expense from discontinued operations, net of tax				(4.5)
Total reclassifications for the period			21.1	27.2
Derivative Adjustments [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period			(0.3)	6.1
Derivative Adjustments [Member] | Reclassified From Accumulated Other Comprehensive Loss [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Total (income) loss from continuing operations, before tax			(0.4)	10.3
Tax impact			0.1	(3.6)
Total (income) loss from continuing operations, net of tax			(0.3)	6.7
Total (income) from discontinued operations, net of tax				(0.6)
Total (income) loss, net of tax			(0.3)	6.1
Derivative Adjustments [Member] | Natural Gas Commodity Contracts [Member] | Reclassified From Accumulated Other Comprehensive Loss [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Cost of goods sold			(0.3)	1.2
Derivative Adjustments [Member] | Foreign Exchange Contracts - Purchases [Member] | Reclassified From Accumulated Other Comprehensive Loss [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Cost of goods sold			0.1	(0.4)
Derivative Adjustments [Member] | Foreign Exchange Contracts - Sales [Member] | Reclassified From Accumulated Other Comprehensive Loss [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Net sales			(0.2)	(1.2)
Derivative Adjustments [Member] | Interest Rate Swap Contracts [Member] | Reclassified From Accumulated Other Comprehensive Loss [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Interest expense				10.7
Prior Service Cost Amortization [Member] | Reclassified From Accumulated Other Comprehensive Loss [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Cost of goods sold			0.7	0.6
Selling, general and administrative expenses			0.4	0.4
Amortization Of Net Actuarial Loss [Member] | Reclassified From Accumulated Other Comprehensive Loss [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Cost of goods sold			5.4	17.1
Selling, general and administrative expenses			5.7	11.4
Partial Settlement [Member] | Reclassified From Accumulated Other Comprehensive Loss [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Cost of goods sold			12.5
Selling, general and administrative expenses			8.3
Pension And Postretirement Adjustments [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period			21.4	21.1
Pension And Postretirement Adjustments [Member] | Reclassified From Accumulated Other Comprehensive Loss [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Total expense from continuing operations, before tax			33.0	29.5
Tax impact			(11.6)	(11.3)
Total expense from continuing operations, net of tax			21.4	18.2
Total expense from discontinued operations, net of tax				2.9
Total expense, net of tax			$ 21.4	$ 21.1