Condensed Consolidating Financial Statements (Balance Sheets) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Current Assets:
Cash and cash equivalents	$ 61.3	$ 50.2	$ 54.7	$ 38.9
Accounts and notes receivable, net	689.9	469.8
Inventories, net	538.8	418.5
Other assets	76.7	67.4
Total current assets	1,366.7	1,005.9
Property, plant and equipment, net	371.7	361.4
Goodwill	199.0	195.1
Investment in subsidiaries	0.0	0.0
Deferred income taxes	141.3	136.7
Other assets, net	67.1	61.2
Intercompany receivables (payables), net	0.0	0.0
Total assets	2,145.8	1,760.3
Current Liabilities:
Short-term debt	251.3	52.4
Current maturities of long-term debt	15.0	200.1
Accounts payable	442.5	361.2
Accrued expenses	257.2	265.9
Income taxes (receivable) payable	23.5	9.0
Total current liabilities	989.5	888.6
Long-term debt	922.6	615.7
Post-retirement benefits, other than pensions	2.1	2.8
Pensions	89.5	87.5
Other liabilities	131.5	127.7
Total liabilities	2,135.2	1,722.3
Commitments and contingencies
Total stockholders' equity	10.6	38.0
Total liabilities and stockholders' equity	2,145.8	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	(12.3)	(5.1)
Other assets	(54.0)	(61.7)
Total current assets	(66.3)	(66.8)
Property, plant and equipment, net	(4.6)	0.0
Goodwill	0.0	0.0
Investment in subsidiaries	(1,626.1)	(1,691.1)
Deferred income taxes	(14.7)	(14.7)
Other assets, net	(2.1)	(1.4)
Intercompany receivables (payables), net	(73.2)	(73.2)
Total assets	(1,787.0)	(1,847.2)
Current Liabilities:
Short-term debt	0.0	0.0
Current maturities of long-term debt	0.0	0.0
Accounts payable	(0.6)	0.0
Accrued expenses	0.0	0.0
Income taxes (receivable) payable	(79.2)	(79.3)
Total current liabilities	(79.8)	(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	(2.5)	(2.5)
Total liabilities	(82.3)	(81.8)
Commitments and contingencies
Total stockholders' equity	(1,704.7)	(1,765.4)
Total liabilities and stockholders' equity	(1,787.0)	(1,847.2)
Parent [Member]
Current Assets:
Cash and cash equivalents	3.4	1.2	1.6	0.5
Accounts and notes receivable, net	0.0	0.0
Inventories, net	0.0	0.0
Other assets	14.5	12.8
Total current assets	17.9	14.0
Property, plant and equipment, net	0.0	0.0
Goodwill	0.0	0.0
Investment in subsidiaries	1,095.6	1,166.9
Deferred income taxes	11.9	6.8
Other assets, net	1.7	3.6
Intercompany receivables (payables), net	(161.4)	(382.4)
Total assets	965.7	808.9
Current Liabilities:
Short-term debt	0.0	0.0
Current maturities of long-term debt	14.4	199.3
Accounts payable	21.5	18.5
Accrued expenses	2.0	6.3
Income taxes (receivable) payable	9.2	(54.0)
Total current liabilities	47.1	170.1
Long-term debt	907.9	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	955.0	771.0
Commitments and contingencies
Total stockholders' equity	10.7	37.9
Total liabilities and stockholders' equity	965.7	808.9
Guarantor Subsidiaries [Member]
Current Assets:
Cash and cash equivalents	24.9	17.1	24.0	7.8
Accounts and notes receivable, net	49.0	30.6
Inventories, net	414.2	314.7
Other assets	52.4	48.8
Total current assets	540.5	411.2
Property, plant and equipment, net	243.8	237.6
Goodwill	134.9	134.9
Investment in subsidiaries	531.1	524.7
Deferred income taxes	112.3	113.5
Other assets, net	40.4	40.0
Intercompany receivables (payables), net	153.6	375.2
Total assets	1,756.6	1,837.1
Current Liabilities:
Short-term debt	0.0	0.0
Current maturities of long-term debt	0.3	0.4
Accounts payable	291.6	248.5
Accrued expenses	201.2	206.3
Income taxes (receivable) payable	51.1	89.8
Total current liabilities	544.2	545.0
Long-term debt	14.4	14.5
Post-retirement benefits, other than pensions	2.1	2.8
Pensions	76.5	75.5
Other liabilities	122.6	119.1
Total liabilities	759.8	756.9
Commitments and contingencies
Total stockholders' equity	996.8	1,080.2
Total liabilities and stockholders' equity	1,756.6	1,837.1
Non-Guarantor Subsidiaries [Member]
Current Assets:
Cash and cash equivalents	33.0	31.9	$ 29.1	$ 30.6
Accounts and notes receivable, net	640.9	439.2
Inventories, net	136.9	108.9
Other assets	63.8	67.5
Total current assets	874.6	647.5
Property, plant and equipment, net	132.5	123.8
Goodwill	64.1	60.2
Investment in subsidiaries	(0.6)	(0.5)
Deferred income taxes	31.8	31.1
Other assets, net	27.1	19.0
Intercompany receivables (payables), net	81.0	80.4
Total assets	1,210.5	961.5
Current Liabilities:
Short-term debt	251.3	52.4
Current maturities of long-term debt	0.3	0.4
Accounts payable	130.0	94.2
Accrued expenses	54.0	53.3
Income taxes (receivable) payable	42.4	52.5
Total current liabilities	478.0	252.8
Long-term debt	0.3	0.3
Post-retirement benefits, other than pensions	0.0	0.0
Pensions	13.0	12.0
Other liabilities	11.4	11.1
Total liabilities	502.7	276.2
Commitments and contingencies
Total stockholders' equity	707.8	685.3
Total liabilities and stockholders' equity	$ 1,210.5	$ 961.5