Condensed Consolidating Financial Statements (Balance Sheets) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Current Assets:
Cash and cash equivalents	$ 60.7	$ 50.2	$ 47.8	$ 38.9
Accounts and notes receivable, net	598.1	469.8
Inventories, net	530.9	418.5
Other assets	80.9	67.4
Total current assets	1,270.6	1,005.9
Property, plant and equipment, net	374.6	361.4
Goodwill	200.6	195.1
Investment in subsidiaries	0.0	0.0
Deferred income taxes	143.3	136.7
Other assets, net	66.6	61.2
Intercompany receivables (payables), net	0.0	0.0
Total assets	2,055.7	1,760.3
Current Liabilities:
Short-term debt	326.0	52.4
Current maturities of long-term debt	22.4	200.1
Accounts payable	394.5	361.2
Accrued expenses	278.4	265.9
Income taxes (receivable) payable	2.4	9.0
Total current liabilities	1,023.7	888.6
Long-term debt	775.7	615.7
Post-retirement benefits, other than pensions	1.9	2.8
Pensions	90.2	87.5
Other liabilities	131.7	127.7
Total liabilities	2,023.2	1,722.3
Commitments and contingencies
Total stockholders' equity	32.5	38.0
Total liabilities and stockholders' equity	2,055.7	1,760.3
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	(4.8)	(5.1)
Other assets	(28.3)	(61.7)
Total current assets	(33.1)	(66.8)
Property, plant and equipment, net	(4.3)	0.0
Goodwill	17.1	0.0
Investment in subsidiaries	(1,596.5)	(1,691.1)
Deferred income taxes	(12.2)	(14.7)
Other assets, net	(1.4)	(1.4)
Intercompany receivables (payables), net	(102.5)	(73.2)
Total assets	(1,732.9)	(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 (receivable) 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	(1,682.1)	(1,765.4)
Total liabilities and stockholders' equity	(1,732.9)	(1,847.2)
Parent [Member]
Current Assets:
Cash and cash equivalents	1.2	1.2	4.5	0.5
Accounts and notes receivable, net	0.0	0.0
Inventories, net	0.0	0.0
Other assets	14.2	12.8
Total current assets	15.4	14.0
Property, plant and equipment, net	0.0	0.0
Goodwill	0.0	0.0
Investment in subsidiaries	1,212.8	1,166.9
Deferred income taxes	11.0	6.8
Other assets, net	1.8	3.6
Intercompany receivables (payables), net	(453.9)	(382.4)
Total assets	787.1	808.9
Current Liabilities:
Short-term debt	0.0	0.0
Current maturities of long-term debt	21.9	199.3
Accounts payable	21.3	18.5
Accrued expenses	5.7	6.3
Income taxes (receivable) payable	(55.7)	(54.0)
Total current liabilities	(6.8)	170.1
Long-term debt	761.1	600.9
Post-retirement benefits, other than pensions	0.0	0.0
Pensions	0.0	0.0
Other liabilities	0.3	0.0
Total liabilities	754.6	771.0
Commitments and contingencies
Total stockholders' equity	32.5	37.9
Total liabilities and stockholders' equity	787.1	808.9
Guarantor Subsidiaries [Member]
Current Assets:
Cash and cash equivalents	22.4	17.1	15.9	7.8
Accounts and notes receivable, net	35.5	30.6
Inventories, net	392.2	314.7
Other assets	34.3	48.8
Total current assets	484.4	411.2
Property, plant and equipment, net	243.7	237.6
Goodwill	117.8	134.9
Investment in subsidiaries	383.7	524.7
Deferred income taxes	112.0	113.5
Other assets, net	42.1	40.0
Intercompany receivables (payables), net	461.3	375.2
Total assets	1,845.0	1,837.1
Current Liabilities:
Short-term debt	0.0	0.0
Current maturities of long-term debt	0.3	0.4
Accounts payable	252.7	248.5
Accrued expenses	216.6	206.3
Income taxes (receivable) payable	60.4	89.8
Total current liabilities	530.0	545.0
Long-term debt	14.3	14.5
Post-retirement benefits, other than pensions	1.9	2.8
Pensions	77.1	75.5
Other liabilities	119.9	119.1
Total liabilities	743.2	756.9
Commitments and contingencies
Total stockholders' equity	1,101.8	1,080.2
Total liabilities and stockholders' equity	1,845.0	1,837.1
Non-Guarantor Subsidiaries [Member]
Current Assets:
Cash and cash equivalents	37.1	31.9	$ 27.4	$ 30.6
Accounts and notes receivable, net	562.6	439.2
Inventories, net	143.5	108.9
Other assets	60.7	67.5
Total current assets	803.9	647.5
Property, plant and equipment, net	135.2	123.8
Goodwill	65.7	60.2
Investment in subsidiaries	0.0	(0.5)
Deferred income taxes	32.5	31.1
Other assets, net	24.1	19.0
Intercompany receivables (payables), net	95.1	80.4
Total assets	1,156.5	961.5
Current Liabilities:
Short-term debt	326.0	52.4
Current maturities of long-term debt	0.2	0.4
Accounts payable	120.5	94.2
Accrued expenses	56.1	53.3
Income taxes (receivable) payable	48.5	52.5
Total current liabilities	551.3	252.8
Long-term debt	0.3	0.3
Post-retirement benefits, other than pensions	0.0	0.0
Pensions	13.1	12.0
Other liabilities	11.5	11.1
Total liabilities	576.2	276.2
Commitments and contingencies
Total stockholders' equity	580.3	685.3
Total liabilities and stockholders' equity	$ 1,156.5	$ 961.5