Supplemental Guarantor Condensed Financial Information (Condensed Balance Sheets) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Schedule of Financial Position [Line Items]
Cash and cash equivalents	$ 84.7	$ 101.1
Receivables, net of allowances	714.2	664.5
Inventories	736.1	768.2
Prepaid expenses and other	60.0	65.4
Total current assets	1,595.0	1,599.2
Property, plant and equipment, net	530.3	529.3
Deferred income taxes	7.9	20.4
Intercompany accounts	0.0	0.0
Investment in subsidiaries	0.0	0.0
Goodwill	11.0	12.0	$ 22.2
Intangible assets, net	23.3	28.3
Unconsolidated affiliated companies	0.2	9.0
Other non-current assets	67.6	43.4
Total assets	2,235.3	2,241.6	2,454.6
Accounts payable	437.5	414.0
Accrued liabilities	308.8	419.6
Current portion of long-term debt	46.9	67.5
Total current liabilities	793.2	901.1
Long-term debt	1,038.8	871.1
Deferred income taxes	108.6	126.7
Intercompany accounts	0.0	0.0
Other liabilities	162.9	173.8
Total liabilities	2,103.5	2,072.7
Total Company shareholders’ equity	129.2	153.1
Noncontrolling interest	2.6	15.8
Total liabilities and equity	2,235.3	2,241.6
Eliminations
Schedule of Financial Position [Line Items]
Cash and cash equivalents	0.0	0.0
Receivables, net of allowances	0.0	0.0
Inventories	0.0	0.0
Prepaid expenses and other	0.0	0.0
Total current assets	0.0	0.0
Property, plant and equipment, net	0.0	0.0
Deferred income taxes	(26.1)	(42.9)
Intercompany accounts	(1,207.8)	(1,266.5)
Investment in subsidiaries	(600.5)	(685.9)
Goodwill	0.0	0.0
Intangible assets, net	0.0	0.0
Unconsolidated affiliated companies	0.0	0.0
Other non-current assets	0.0	0.0
Total assets	(1,834.4)	(1,995.3)
Accounts payable	0.0	0.0
Accrued liabilities	0.0	0.0
Current portion of long-term debt	0.0	0.0
Total current liabilities	0.0	0.0
Long-term debt	0.0	0.0
Deferred income taxes	(26.1)	(42.9)
Intercompany accounts	(1,207.8)	(1,266.5)
Other liabilities	0.0	0.0
Total liabilities	(1,233.9)	(1,309.4)
Total Company shareholders’ equity	(600.5)	(685.9)
Noncontrolling interest	0.0	0.0
Total liabilities and equity	(1,834.4)	(1,995.3)
Parent
Schedule of Financial Position [Line Items]
Intercompany accounts	1,022.7	1,092.4	$ 1,114.5	$ 1,280.8
Parent | Reportable Legal Entities
Schedule of Financial Position [Line Items]
Cash and cash equivalents	0.0	0.0
Receivables, net of allowances	0.0	0.0
Inventories	0.0	0.0
Prepaid expenses and other	0.0	0.0
Total current assets	0.0	0.0
Property, plant and equipment, net	0.3	0.3
Deferred income taxes	0.0	0.0
Intercompany accounts	1,022.7	1,092.4
Investment in subsidiaries	19.4	73.2
Goodwill	0.0	0.0
Intangible assets, net	0.1	0.0
Unconsolidated affiliated companies	0.0	0.0
Other non-current assets	0.0	0.0
Total assets	1,042.5	1,165.9
Accounts payable	0.0	0.0
Accrued liabilities	15.6	93.4
Current portion of long-term debt	0.0	0.0
Total current liabilities	15.6	93.4
Long-term debt	776.3	772.3
Deferred income taxes	121.4	147.1
Intercompany accounts	0.0	0.0
Other liabilities	0.0	0.0
Total liabilities	913.3	1,012.8
Total Company shareholders’ equity	129.2	153.1
Noncontrolling interest	0.0	0.0
Total liabilities and equity	1,042.5	1,165.9
Guarantor Subsidiaries | Reportable Legal Entities
Schedule of Financial Position [Line Items]
Cash and cash equivalents	0.0	1.0
Receivables, net of allowances	226.2	202.9
Inventories	380.2	363.4
Prepaid expenses and other	27.0	26.2
Total current assets	633.4	593.5
Property, plant and equipment, net	209.3	202.8
Deferred income taxes	26.1	42.9
Intercompany accounts	114.8	104.7
Investment in subsidiaries	581.1	612.7
Goodwill	5.6	5.6
Intangible assets, net	5.6	6.0
Unconsolidated affiliated companies	0.0	8.8
Other non-current assets	17.3	15.5
Total assets	1,593.2	1,592.5
Accounts payable	118.1	112.4
Accrued liabilities	88.6	105.0
Current portion of long-term debt	0.0	0.0
Total current liabilities	206.7	217.4
Long-term debt	219.9	75.9
Deferred income taxes	0.0	0.0
Intercompany accounts	1,092.3	1,161.1
Other liabilities	54.9	64.9
Total liabilities	1,573.8	1,519.3
Total Company shareholders’ equity	19.4	73.2
Noncontrolling interest	0.0	0.0
Total liabilities and equity	1,593.2	1,592.5
Non- Guarantor Subsidiaries | Reportable Legal Entities
Schedule of Financial Position [Line Items]
Cash and cash equivalents	84.7	100.1
Receivables, net of allowances	488.0	461.6
Inventories	355.9	404.8
Prepaid expenses and other	33.0	39.2
Total current assets	961.6	1,005.7
Property, plant and equipment, net	320.7	326.2
Deferred income taxes	7.9	20.4
Intercompany accounts	70.3	69.4
Investment in subsidiaries	0.0	0.0
Goodwill	5.4	6.4
Intangible assets, net	17.6	22.3
Unconsolidated affiliated companies	0.2	0.2
Other non-current assets	50.3	27.9
Total assets	1,434.0	1,478.5
Accounts payable	319.4	301.6
Accrued liabilities	204.6	221.2
Current portion of long-term debt	46.9	67.5
Total current liabilities	570.9	590.3
Long-term debt	42.6	22.9
Deferred income taxes	13.3	22.5
Intercompany accounts	115.5	105.4
Other liabilities	108.0	108.9
Total liabilities	850.3	850.0
Total Company shareholders’ equity	581.1	612.7
Noncontrolling interest	2.6	15.8
Total liabilities and equity	$ 1,434.0	$ 1,478.5