Condensed Consolidating Financial Statements (Balance Sheet) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 68.2	$ 50.2	$ 38.9	$ 37.5
Accounts and notes receivable, net	506.5	469.8
Inventories, net	484.2	418.5
Other assets	78.4	67.4
Total current assets	1,137.3	1,005.9
Property, plant and equipment, net of accumulated depreciation of $774.2 and $717.2 in 2017 and 2016, respectively	397.8	361.4	339.6
Goodwill	200.5	195.1	195.1
Investment in subsidiaries	0.0	0.0
Deferred income taxes	94.4	136.7
Other assets, net	61.5	61.2
Intercompany receivables (payables), net	0.0	0.0
Total assets	1,891.5	1,760.3	1,677.4
Current Liabilities:
Short-term debt	0.9	52.4
Current maturities of long-term debt	32.6	200.1
Accounts payable	348.6	361.2
Accrued expenses	270.3	265.9
Income taxes payable	2.1	9.0
Total current liabilities	654.5	888.6
Long-term debt	970.5	615.7
Post-retirement benefits, other than pensions	2.6	2.8
Pensions	84.5	87.5
Other liabilities	129.3	127.7
Total liabilities	1,841.4	1,722.3
Commitments and contingencies
Total stockholders’ equity	50.1	38.0	101.6	9.0
Total liabilities and stockholders' equity	1,891.5	1,760.3
Parent [Member]
Current assets:
Cash and cash equivalents	1.6	1.2	0.5	1.0
Accounts and notes receivable, net	0.0	0.0
Inventories, net	0.0	0.0
Other assets	16.2	12.8
Total current assets	17.8	14.0
Property, plant and equipment, net of accumulated depreciation of $774.2 and $717.2 in 2017 and 2016, respectively	0.0	0.0
Goodwill	0.0	0.0
Investment in subsidiaries	1,257.7	1,166.9
Deferred income taxes	3.9	6.8
Other assets, net	2.1	3.6
Intercompany receivables (payables), net	(559.3)	(382.4)
Total assets	722.2	808.9
Current Liabilities:
Short-term debt	0.0	0.0
Current maturities of long-term debt	29.4	199.3
Accounts payable	21.3	18.5
Accrued expenses	3.1	6.3
Income taxes payable	(64.5)	(54.0)
Total current liabilities	(10.7)	170.1
Long-term debt	682.8	600.9
Post-retirement benefits, other than pensions	0.0	0.0
Pensions	0.0	0.0
Other liabilities	0.0	0.0
Total liabilities	672.1	771.0
Commitments and contingencies
Total stockholders’ equity	50.1	37.9
Total liabilities and stockholders' equity	722.2	808.9
Guarantor Subsidiaries [Member]
Current assets:
Cash and cash equivalents	28.0	17.1	7.8	11.5
Accounts and notes receivable, net	35.3	30.6
Inventories, net	355.7	314.7
Other assets	23.1	48.8
Total current assets	442.1	411.2
Property, plant and equipment, net of accumulated depreciation of $774.2 and $717.2 in 2017 and 2016, respectively	257.6	237.6
Goodwill	134.9	134.9
Investment in subsidiaries	365.8	524.7
Deferred income taxes	69.1	113.5
Other assets, net	41.3	40.0
Intercompany receivables (payables), net	554.7	375.2
Total assets	1,865.5	1,837.1
Current Liabilities:
Short-term debt	0.0	0.0
Current maturities of long-term debt	2.9	0.4
Accounts payable	228.0	248.5
Accrued expenses	209.4	206.3
Income taxes payable	56.5	89.8
Total current liabilities	496.8	545.0
Long-term debt	11.7	14.5
Post-retirement benefits, other than pensions	2.6	2.8
Pensions	74.7	75.5
Other liabilities	120.6	119.1
Total liabilities	706.4	756.9
Commitments and contingencies
Total stockholders’ equity	1,159.1	1,080.2
Total liabilities and stockholders' equity	1,865.5	1,837.1
Non-Guarantor Subsidiaries [Member]
Current assets:
Cash and cash equivalents	38.6	31.9	30.6	25.0
Accounts and notes receivable, net	471.2	439.2
Inventories, net	131.9	108.9
Other assets	67.5	67.5
Total current assets	709.2	647.5
Property, plant and equipment, net of accumulated depreciation of $774.2 and $717.2 in 2017 and 2016, respectively	144.4	123.8
Goodwill	65.6	60.2
Investment in subsidiaries	(0.6)	(0.5)
Deferred income taxes	33.6	31.1
Other assets, net	19.6	19.0
Intercompany receivables (payables), net	107.4	80.4
Total assets	1,079.2	961.5
Current Liabilities:
Short-term debt	0.9	52.4
Current maturities of long-term debt	0.3	0.4
Accounts payable	99.3	94.2
Accrued expenses	57.8	53.3
Income taxes payable	60.9	52.5
Total current liabilities	219.2	252.8
Long-term debt	276.0	0.3
Post-retirement benefits, other than pensions	0.0	0.0
Pensions	9.8	12.0
Other liabilities	8.7	11.1
Total liabilities	513.7	276.2
Commitments and contingencies
Total stockholders’ equity	565.5	685.3
Total liabilities and stockholders' equity	1,079.2	961.5
Eliminations [Member]
Current assets:
Cash and cash equivalents	0.0	0.0	$ 0.0	$ 0.0
Accounts and notes receivable, net	0.0	0.0
Inventories, net	(3.4)	(5.1)
Other assets	(28.4)	(61.7)
Total current assets	(31.8)	(66.8)
Property, plant and equipment, net of accumulated depreciation of $774.2 and $717.2 in 2017 and 2016, respectively	(4.2)	0.0
Goodwill	0.0	0.0
Investment in subsidiaries	(1,622.9)	(1,691.1)
Deferred income taxes	(12.2)	(14.7)
Other assets, net	(1.5)	(1.4)
Intercompany receivables (payables), net	(102.8)	(73.2)
Total assets	(1,775.4)	(1,847.2)
Current Liabilities:
Short-term debt	0.0	0.0
Current maturities of long-term debt	0.0	0.0
Accounts payable	0.0	0.0
Accrued expenses	0.0	0.0
Income taxes payable	(50.8)	(79.3)
Total current liabilities	(50.8)	(79.3)
Long-term debt	0.0	0.0
Post-retirement benefits, other than pensions	0.0	0.0
Pensions	0.0	0.0
Other liabilities	0.0	(2.5)
Total liabilities	(50.8)	(81.8)
Commitments and contingencies
Total stockholders’ equity	(1,724.6)	(1,765.4)
Total liabilities and stockholders' equity	$ (1,775.4)	$ (1,847.2)