Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Assets	$ 2,819.2		$ 2,819.2		$ 2,784.1
Net sales to external customers:
Net sales	657.4	$ 707.4	2,015.0	$ 2,157.9
Segment EBIT:
Total EBIT for reportable segments	64.8	86.1	209.6	259.4
Unallocated corporate expenses	(12.2)	(16.6)	(37.4)	(44.8)
Unallocated Portion of Pension Settlement Charges	(10.3)	3.6	(11.9)	(223.2)
Continued Dumping & Subsidy Offset Act (CDSOA) receipts, net of expense	(0.2)	0.0	53.6	0.0
Interest expense	(8.0)	(8.6)	(25.1)	(25.0)
Investment Income, Interest	0.4	0.6	1.1	2.0
Income (Loss) Before Income Taxes	34.5	57.9	189.9	(31.6)
Mobile Industries [Member]
Net sales to external customers:
Net sales	353.1	396.4	1,104.1	1,178.0
Segment EBIT:
Total EBIT for reportable segments	24.1	43.0	89.6	114.4
Process Industries [Member]
Net sales to external customers:
Net sales	304.3	311.0	910.9	979.9
Segment EBIT:
Total EBIT for reportable segments	$ 40.7	$ 43.1	$ 120.0	$ 145.0