Condensed Consolidating Financial Statements (Balance Sheets) (Details) - USD ($) $ in Millions	Sep. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Mar. 31, 2015	Dec. 31, 2014
Current Assets:
Cash and cash equivalents	$ 47.8	$ 38.9	$ 38.9	$ 35.1	$ 37.5	$ 37.5
Accounts and notes receivable, net	570.4		422.8
Inventories, net	474.0		418.8
Other assets	74.3		57.7
Total current assets	1,166.5		938.2
Property, plant and equipment, net	346.2		339.6
Goodwill	198.5		195.1
Investment in subsidiaries	0.0		0.0
Deferred income taxes	147.4		145.7
Other assets, net	68.0		58.8
Intercompany receivables (payables), net	0.0		0.0
Total assets	1,926.6		1,677.4
Current Liabilities:
Short-term debt	327.8		204.1
Current maturities of long-term debt	215.6		31.0
Accounts payable	371.7		320.1
Accrued expenses	272.2		242.6
Income taxes payable	0.8		26.0
Total current liabilities	1,188.1		823.8
Long-term debt	512.5		506.0
Post-retirement benefits, other than pensions	2.2		4.1
Pensions	72.9		120.8
Other liabilities	126.7		121.1
Total liabilities	1,902.4		1,575.8
Commitments and contingencies
Total stockholders' equity	24.2		101.6
Total liabilities and stockholders' equity	1,926.6		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	(6.6)		(4.4)
Other assets	(61.1)		(59.9)
Total current assets	(67.7)		(64.3)
Property, plant and equipment, net	0.0		0.0
Goodwill	0.0		0.0
Investment in subsidiaries	(1,445.6)		(1,216.0)
Deferred income taxes	(15.1)		(14.7)
Other assets, net	(1.5)		(1.5)
Intercompany receivables (payables), net	(73.3)		0.0
Total assets	(1,603.2)		(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	(4.7)		(4.2)
Total liabilities	(82.2)		(79.7)
Commitments and contingencies
Total stockholders' equity	(1,521.0)		(1,216.8)
Total liabilities and stockholders' equity	(1,603.2)		(1,296.5)
Parent [Member]
Current Assets:
Cash and cash equivalents	4.5	0.5	0.5	1.3	1.0
Accounts and notes receivable, net	0.0		0.0
Inventories, net	0.0		0.0
Other assets	4.8		3.3
Total current assets	9.3		3.8
Property, plant and equipment, net	0.0		0.0
Goodwill	0.0		0.0
Investment in subsidiaries	1,137.6		879.0
Deferred income taxes	5.0		5.4
Other assets, net	2.1		1.5
Intercompany receivables (payables), net	(450.8)		(278.6)
Total assets	703.2		611.1
Current Liabilities:
Short-term debt	0.0		0.0
Current maturities of long-term debt	214.7		29.8
Accounts payable	18.5		16.1
Accrued expenses	6.1		15.8
Income taxes payable	(58.4)		(43.0)
Total current liabilities	180.9		18.7
Long-term debt	497.6		490.4
Post-retirement benefits, other than pensions	0.0		0.0
Pensions	0.0		0.0
Other liabilities	0.5		0.4
Total liabilities	679.0		509.5
Commitments and contingencies
Total stockholders' equity	24.2		101.6
Total liabilities and stockholders' equity	703.2		611.1
Guarantor Subsidiaries [Member]
Current Assets:
Cash and cash equivalents	15.9	7.8	7.8	12.5	11.5
Accounts and notes receivable, net	42.4		25.9
Inventories, net	361.3		324.3
Other assets	50.5		46.9
Total current assets	470.1		404.9
Property, plant and equipment, net	269.0		261.8
Goodwill	134.9		134.9
Investment in subsidiaries	308.6		337.6
Deferred income taxes	129.0		126.6
Other assets, net	38.6		38.2
Intercompany receivables (payables), net	439.0		253.3
Total assets	1,789.2		1,557.3
Current Liabilities:
Short-term debt	0.0		0.0
Current maturities of long-term debt	0.6		0.8
Accounts payable	283.0		237.9
Accrued expenses	208.3		176.7
Income taxes payable	79.3		106.6
Total current liabilities	571.2		522.0
Long-term debt	14.6		15.1
Post-retirement benefits, other than pensions	2.2		4.1
Pensions	64.7		111.9
Other liabilities	120.2		114.4
Total liabilities	772.9		767.5
Commitments and contingencies
Total stockholders' equity	1,016.3		789.8
Total liabilities and stockholders' equity	1,789.2		1,557.3
Non-Guarantor Subsidiaries [Member]
Current Assets:
Cash and cash equivalents	27.4	$ 30.6	30.6	$ 21.3	$ 25.0
Accounts and notes receivable, net	528.0		396.9
Inventories, net	119.3		98.9
Other assets	80.1		67.4
Total current assets	754.8		593.8
Property, plant and equipment, net	77.2		77.8
Goodwill	63.6		60.2
Investment in subsidiaries	(0.6)		(0.6)
Deferred income taxes	28.5		28.4
Other assets, net	28.8		20.6
Intercompany receivables (payables), net	85.1		25.3
Total assets	1,037.4		805.5
Current Liabilities:
Short-term debt	327.8		204.1
Current maturities of long-term debt	0.3		0.4
Accounts payable	70.2		66.1
Accrued expenses	57.8		50.1
Income taxes payable	57.4		37.9
Total current liabilities	513.5		358.6
Long-term debt	0.3		0.5
Post-retirement benefits, other than pensions	0.0		0.0
Pensions	8.2		8.9
Other liabilities	10.7		10.5
Total liabilities	532.7		378.5
Commitments and contingencies
Total stockholders' equity	504.7		427.0
Total liabilities and stockholders' equity	$ 1,037.4		$ 805.5