Accumulated Other Comprehensive (Loss) (Reclassification out of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Cost of goods sold	$ 219.7	$ 222.8	$ 435.8	$ 425.9
Net sales	330.8	314.3	646.2	601.7
Interest expense	9.2	12.5	18.4	34.4
Total (income) loss from continuing operations, before tax	(70.1)	(41.3)	(125.5)	(46.2)
Tax impact	28.6	24.7	53.2	36.7
Total (income) from discontinued operations, net of tax	0.2	(0.3)	0.6	2.5
Total (income) loss, net of tax	(41.3)	(16.9)	(71.7)	(7.0)
Total expense from discontinued operations, net of tax				(4.5)
Selling, general and administrative expenses	$ 52.4	$ 55.8	107.0	109.5
Total reclassifications for the period			4.8	20.0
Derivative Adjustments [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period			(0.5)	6.1
Derivative Adjustments [Member] | Reclassification From Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Total (income) loss from continuing operations, before tax			(0.7)	10.3
Tax impact			0.2	(3.6)
Total (income) loss from continuing operations, net of tax			(0.5)	6.7
Total (income) from discontinued operations, net of tax				(0.6)
Total (income) loss, net of tax			(0.5)	6.1
Derivative Adjustments [Member] | Natural Gas Commodity Contracts [Member] | Reclassification From Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Cost of goods sold			(0.3)	1.3
Derivative Adjustments [Member] | Foreign Exchange Contracts - Purchases [Member] | Reclassification From Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Cost of goods sold				(0.6)
Derivative Adjustments [Member] | Foreign Exchange Contracts - Sales [Member] | Reclassification From Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Net sales			(0.4)	(1.1)
Derivative Adjustments [Member] | Interest Rate Swap Contracts [Member] | Reclassification From Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Interest expense				10.7
Prior Service Cost Amortization [Member] | Reclassification From Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Cost of goods sold			0.4	0.3
Selling, general and administrative expenses			0.3	0.2
Amortization Of Net Actuarial Loss [Member] | Reclassification From Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Cost of goods sold			3.6	8.9
Selling, general and administrative expenses			3.7	9.2
Pension And Postretirement Adjustments [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period			5.3	13.9
Pension And Postretirement Adjustments [Member] | Reclassification From Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Total expense from continuing operations, before tax			8.0	18.6
Tax impact			(2.7)	(7.6)
Total expense from continuing operations, net of tax			5.3	11.0
Total expense from discontinued operations, net of tax				2.9
Total expense, net of tax			$ 5.3	$ 13.9