Shareholders' Equity (Reclassification out of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Cost of goods sold	$ 863.3	$ 854.9	$ 911.2
Net sales	1,234.5	1,231.3	1,294.3
Interest expense	49.8	45.3	46.0
Total income (loss) from continuing operations, before tax	144.3	80.1	148.4
Tax impact	(50.4)	(53.5)	(69.3)
Total (loss) from discontinued operations, net of tax	10.8	67.6	(15.3)
Total income (loss), net of tax	104.7	94.2	63.8
Selling, general and administrative expenses	225.2	267.7	250.1
Total expense from discontinued operations net of tax	(4.5)	26.0	$ (0.8)
Reclassification From Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period	33.6	42.1
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	7.9	(0.4)
Tax impact	(2.8)	0.1
Total income (loss) from continuing operations, net of tax	5.1	(0.3)
Total (loss) from discontinued operations, net of tax	(0.6)	(2.5)
Total income (loss), net of tax	4.5	(2.8)
Derivative Adjustments [Member] | Natural Gas Contracts [Member] | Reclassification From Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Cost of goods sold	1.2	4.4
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	(0.2)	(1.8)
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	(1.4)	(3.8)
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	8.3	0.8
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	0.6	0.2
Selling, general and administrative expenses	0.6	0.4
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	20.7	22.1
Selling, general and administrative expenses	18.4	21.3
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	40.3	44.0
Tax impact	(14.1)	(15.4)
Total expense from continuing operations, net of tax	26.2	28.6
Total expense from discontinued operations net of tax	2.9	16.3
Total expense, net of tax	$ 29.1	$ 44.9