Condensed Consolidating Financial Statements (Balance Sheets) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Current Assets:
Cash and cash equivalents	$ 57.1		$ 68.2	$ 48.8	$ 50.2
Accounts and notes receivable, net	528.5	$ 514.8	506.5
Inventories, net	561.5		484.2
Disposal Group, Including Discontinued Operation, Assets	93.3
Other assets	106.4		78.4
Total current assets	1,346.8		1,137.3
Property, plant and equipment, net	390.1		397.8
Goodwill	190.3		200.5
Investment in subsidiaries	0.0		0.0
Deferred income taxes	94.0		94.4
Other assets, net	64.9		61.5
Intercompany receivables (payables), net	0.0		0.0
Total assets	2,086.1		1,891.5
Current Liabilities:
Short-term debt	0.9		0.9
Current maturities of long-term debt	29.9		32.6
Accounts payable	405.6	$ 357.9	348.6
Accrued expenses	226.0		270.3
Disposal Group, Including Discontinued Operation, Liabilities	28.7
Income taxes (receivable) payable	21.7		2.1
Total current liabilities	712.8		654.5
Long-term debt	1,258.3		970.5
Post-retirement benefits, other than pensions	2.5		2.6
Pensions	85.9		84.5
Other liabilities	129.2		129.3
Total liabilities	2,188.7		1,841.4
Commitments and contingencies
Total stockholders' equity	(102.6)		50.1
Total liabilities and stockholders' equity	2,086.1		1,891.5
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	(5.5)		(3.4)
Disposal Group, Including Discontinued Operation, Assets	0.0
Other assets	(33.8)		(28.4)
Total current assets	(39.3)		(31.8)
Property, plant and equipment, net	(4.0)		(4.2)
Goodwill	0.0		0.0
Investment in subsidiaries	(1,984.8)		(1,622.9)
Deferred income taxes	(12.2)		(12.2)
Other assets, net	(1.5)		(1.5)
Intercompany receivables (payables), net	(102.8)		(102.8)
Total assets	(2,144.6)		(1,775.4)
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
Disposal Group, Including Discontinued Operation, Liabilities	0.0
Income taxes (receivable) payable	(50.8)		(50.8)
Total current liabilities	(50.8)		(50.8)
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		0.0
Total liabilities	(50.8)		(50.8)
Commitments and contingencies
Total stockholders' equity	(2,093.8)		(1,724.6)
Total liabilities and stockholders' equity	(2,144.6)		(1,775.4)
Parent [Member]
Current Assets:
Cash and cash equivalents	1.4		1.6	1.5	1.2
Accounts and notes receivable, net	0.0		0.0
Inventories, net	0.0		0.0
Disposal Group, Including Discontinued Operation, Assets	0.0
Other assets	7.3		16.2
Total current assets	8.7		17.8
Property, plant and equipment, net	0.0		0.0
Goodwill	0.0		0.0
Investment in subsidiaries	1,524.7		1,257.7
Deferred income taxes	4.7		3.9
Other assets, net	3.1		2.1
Intercompany receivables (payables), net	(555.5)		(559.3)
Total assets	985.7		722.2
Current Liabilities:
Short-term debt	0.0		0.0
Current maturities of long-term debt	29.4		29.4
Accounts payable	21.1		21.3
Accrued expenses	6.0		3.1
Disposal Group, Including Discontinued Operation, Liabilities	0.0
Income taxes (receivable) payable	11.4		(64.5)
Total current liabilities	67.9		(10.7)
Long-term debt	1,021.6		682.8
Post-retirement benefits, other than pensions	0.0		0.0
Pensions	0.0		0.0
Other liabilities	(1.2)		0.0
Total liabilities	1,088.3		672.1
Commitments and contingencies
Total stockholders' equity	(102.6)		50.1
Total liabilities and stockholders' equity	985.7		722.2
Guarantor Subsidiaries [Member]
Current Assets:
Cash and cash equivalents	15.0		28.0	14.0	17.1
Accounts and notes receivable, net	49.4		35.3
Inventories, net	469.2		355.7
Disposal Group, Including Discontinued Operation, Assets	0.0
Other assets	69.8		23.1
Total current assets	603.4		442.1
Property, plant and equipment, net	259.0		257.6
Goodwill	134.9		134.9
Investment in subsidiaries	472.6		365.8
Deferred income taxes	71.5		69.1
Other assets, net	45.0		41.3
Intercompany receivables (payables), net	576.1		554.7
Total assets	2,162.5		1,865.5
Current Liabilities:
Short-term debt	0.0		0.0
Current maturities of long-term debt	0.2		2.9
Accounts payable	278.5		228.0
Accrued expenses	179.1		209.4
Disposal Group, Including Discontinued Operation, Liabilities	0.0
Income taxes (receivable) payable	20.7		56.5
Total current liabilities	478.5		496.8
Long-term debt	11.7		11.7
Post-retirement benefits, other than pensions	2.5		2.6
Pensions	76.3		74.7
Other liabilities	122.1		120.6
Total liabilities	691.1		706.4
Commitments and contingencies
Total stockholders' equity	1,471.4		1,159.1
Total liabilities and stockholders' equity	2,162.5		1,865.5
Non-Guarantor Subsidiaries [Member]
Current Assets:
Cash and cash equivalents	40.7		38.6	$ 33.3	$ 31.9
Accounts and notes receivable, net	479.1		471.2
Inventories, net	97.8		131.9
Disposal Group, Including Discontinued Operation, Assets	93.3
Other assets	63.1		67.5
Total current assets	774.0		709.2
Property, plant and equipment, net	135.1		144.4
Goodwill	55.4		65.6
Investment in subsidiaries	(12.5)		(0.6)
Deferred income taxes	30.0		33.6
Other assets, net	18.3		19.6
Intercompany receivables (payables), net	82.2		107.4
Total assets	1,082.5		1,079.2
Current Liabilities:
Short-term debt	0.9		0.9
Current maturities of long-term debt	0.3		0.3
Accounts payable	106.0		99.3
Accrued expenses	40.9		57.8
Disposal Group, Including Discontinued Operation, Liabilities	28.7
Income taxes (receivable) payable	40.4		60.9
Total current liabilities	217.2		219.2
Long-term debt	225.0		276.0
Post-retirement benefits, other than pensions	0.0		0.0
Pensions	9.6		9.8
Other liabilities	8.3		8.7
Total liabilities	460.1		513.7
Commitments and contingencies
Total stockholders' equity	622.4		565.5
Total liabilities and stockholders' equity	$ 1,082.5		$ 1,079.2