Condensed Consolidating Financial Statements (Balance Sheets) (Details) - USD ($) $ in Millions	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014
Current Assets:
Cash and cash equivalents	$ 54.7	$ 38.9	$ 38.9	$ 47.5	$ 37.5	$ 37.5
Accounts and notes receivable, net	643.5		422.8
Inventories, net	505.7		418.8
Other assets	66.3		57.7
Total current assets	1,270.2		938.2
Property, plant and equipment, net	345.2		339.6
Goodwill	198.5		195.1
Investment in subsidiaries	0.0		0.0
Deferred income taxes	145.0		145.7
Other assets, net	65.3		58.8
Intercompany receivables (payables), net	0.0		0.0
Total assets	2,024.2		1,677.4
Current Liabilities:
Short-term debt	225.4		204.1
Current maturities of long-term debt	230.8		31.0
Accounts payable	399.8		320.1
Accrued expenses	256.5		242.6
Income taxes payable	10.2		26.0
Total current liabilities	1,122.7		823.8
Long-term debt	619.0		506.0
Post-retirement benefits, other than pensions	2.9		4.1
Pensions	122.2		120.8
Other liabilities	126.0		121.1
Total liabilities	1,992.8		1,575.8
Commitments and contingencies
Total stockholders' equity	31.4		101.6
Total liabilities and stockholders' equity	2,024.2		1,677.4
Eliminations [Member]
Current Assets:
Cash and cash equivalents	0.0	0.0	0.0	0.0	0.0
Accounts and notes receivable, net	0.0		0.0
Inventories, net	(6.7)		(4.4)
Other assets	(61.2)		(59.9)
Total current assets	(67.9)		(64.3)
Property, plant and equipment, net	0.0		0.0
Goodwill	0.0		0.0
Investment in subsidiaries	(1,523.4)		(1,216.0)
Deferred income taxes	(14.7)		(14.7)
Other assets, net	(1.5)		(1.5)
Intercompany receivables (payables), net	0.0		0.0
Total assets	(1,607.5)		(1,296.5)
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	(77.5)		(75.5)
Total current liabilities	(77.5)		(75.5)
Long-term debt	0.0		0.0
Post-retirement benefits, other than pensions	0.0		0.0
Pensions	0.0		0.0
Other liabilities	(4.4)		(4.2)
Total liabilities	(81.9)		(79.7)
Commitments and contingencies
Total stockholders' equity	(1,525.6)		(1,216.8)
Total liabilities and stockholders' equity	(1,607.5)		(1,296.5)
Parent [Member]
Current Assets:
Cash and cash equivalents	1.6	0.5	0.5	1.7	1.0
Accounts and notes receivable, net	0.0		0.0
Inventories, net	0.0		0.0
Other assets	4.3		3.3
Total current assets	5.9		3.8
Property, plant and equipment, net	0.0		0.0
Goodwill	0.0		0.0
Investment in subsidiaries	1,035.8		879.0
Deferred income taxes	5.3		5.4
Other assets, net	1.8		1.5
Intercompany receivables (payables), net	(156.4)		(278.6)
Total assets	892.4		611.1
Current Liabilities:
Short-term debt	0.0		0.0
Current maturities of long-term debt	229.8		29.8
Accounts payable	18.7		16.1
Accrued expenses	8.0		15.8
Income taxes payable	0.3		(43.0)
Total current liabilities	256.8		18.7
Long-term debt	603.9		490.4
Post-retirement benefits, other than pensions	0.0		0.0
Pensions	0.0		0.0
Other liabilities	0.3		0.4
Total liabilities	861.0		509.5
Commitments and contingencies
Total stockholders' equity	31.4		101.6
Total liabilities and stockholders' equity	892.4		611.1
Guarantor Subsidiaries [Member]
Current Assets:
Cash and cash equivalents	24.0	7.8	7.8	21.7	11.5
Accounts and notes receivable, net	43.3		25.9
Inventories, net	392.9		324.3
Other assets	52.3		46.9
Total current assets	512.5		404.9
Property, plant and equipment, net	266.0		261.8
Goodwill	134.9		134.9
Investment in subsidiaries	488.2		337.6
Deferred income taxes	125.5		126.6
Other assets, net	38.9		38.2
Intercompany receivables (payables), net	148.4		253.3
Total assets	1,714.4		1,557.3
Current Liabilities:
Short-term debt	0.0		0.0
Current maturities of long-term debt	0.7		0.8
Accounts payable	310.0		237.9
Accrued expenses	191.9		176.7
Income taxes payable	42.7		106.6
Total current liabilities	545.3		522.0
Long-term debt	14.7		15.1
Post-retirement benefits, other than pensions	2.9		4.1
Pensions	113.8		111.9
Other liabilities	118.7		114.4
Total liabilities	795.4		767.5
Commitments and contingencies
Total stockholders' equity	919.0		789.8
Total liabilities and stockholders' equity	1,714.4		1,557.3
Non-Guarantor Subsidiaries [Member]
Current Assets:
Cash and cash equivalents	29.1	$ 30.6	30.6	$ 24.1	$ 25.0
Accounts and notes receivable, net	600.2		396.9
Inventories, net	119.5		98.9
Other assets	70.9		67.4
Total current assets	819.7		593.8
Property, plant and equipment, net	79.2		77.8
Goodwill	63.6		60.2
Investment in subsidiaries	(0.6)		(0.6)
Deferred income taxes	28.9		28.4
Other assets, net	26.1		20.6
Intercompany receivables (payables), net	8.0		25.3
Total assets	1,024.9		805.5
Current Liabilities:
Short-term debt	225.4		204.1
Current maturities of long-term debt	0.3		0.4
Accounts payable	71.1		66.1
Accrued expenses	56.6		50.1
Income taxes payable	44.7		37.9
Total current liabilities	398.1		358.6
Long-term debt	0.4		0.5
Post-retirement benefits, other than pensions	0.0		0.0
Pensions	8.4		8.9
Other liabilities	11.4		10.5
Total liabilities	418.3		378.5
Commitments and contingencies
Total stockholders' equity	606.6		427.0
Total liabilities and stockholders' equity	$ 1,024.9		$ 805.5