Accumulated Other Comprehensive Income (Loss) (Reclassification out of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Cost of goods sold	$ 165.9	$ 140.4	$ 322.4	$ 281.9
Net sales	248.6	225.6	475.9	445.4
Interest expense	9.8	8.9	19.0	17.8
Earnings from continuing operations before income taxes	65.3	68.6	114.7	125.9
Tax impact	(17.7)	(24.9)	(25.9)	(46.7)
Total loss (income), net of tax	(47.3)	(41.3)	(75.1)	(71.7)
Other non-operating (income) expense, net	$ 9.1	$ 8.3	18.1	17.2
Total reclassifications for the period			7.0	4.8
Derivative Gain (Loss) [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period			1.2	(0.5)
Derivative Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Earnings from continuing operations before income taxes			1.6	(0.7)
Tax impact			(0.4)	0.2
Total loss (income), net of tax			1.2	(0.5)
Derivative Gain (Loss) [Member] | Natural Gas Commodity Contracts [Member] | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Cost of goods sold			0.4	(0.3)
Derivative Gain (Loss) [Member] | Foreign Exchange Contracts - Purchases [Member] | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Cost of goods sold			0.1
Derivative Gain (Loss) [Member] | Foreign Exchange Contracts - Sales [Member] | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Net sales			0.3	(0.4)
Derivative Gain (Loss) [Member] | Interest Rate Swap Contracts [Member] | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Interest expense			0.8
Prior Service Cost Amortization [Member] | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Other non-operating (income) expense, net				0.7
Amortization Of Net Actuarial Loss [Member] | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Other non-operating (income) expense, net			7.3	7.3
Pension And Postretirement Adjustments [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period			5.8	5.3
Pension And Postretirement Adjustments [Member] | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Total expense, before tax			7.3	8.0
Tax impact			(1.5)	(2.7)
Total expense, net of tax			$ 5.8	$ 5.3