Guarantor and Non-Guarantor Financial Statements, Balance Sheets (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 174.2	$ 169.5	$ 281.7	$ 273.4
Short-term investments	127.2	129.5
Receivables:
Trade, less allowance for doubtful receivables	123.1	119.8
Intercompany receivables	0	0
Other	11.0	13.4
Inventories	198.1	214.4
Prepaid expenses and other current assets	135.5	44.2
Total current assets	769.1	690.8
Investments in and advances to subsidiaries	0	0
Property, plant, and equipment – net	441.4	429.3
Long-term intercompany receivables	0	0
Net assets of VEBAs	422.2	406.0
Deferred tax assets — net	45.8	69.1
Intangible assets – net	32.9	33.7
Goodwill	37.2	37.2
Other assets	24.0	104.8
Total	1,772.6	1,770.9
Current liabilities:
Accounts payable	72.1	62.9
Intercompany payable	0	0
Accrued salaries, wages, and related expenses	33.8	42.7
Other accrued liabilities	115.1	44.8
Current portion of long-term debt	167.9	0
Short-term capital lease	0.1	0.2
Total current liabilities	389.0	150.6
Deferred tax liability	1.2	1.2
Long-term intercompany payable	0	0
Long-term liabilities	63.7	146.4
Long-term debt	225.0	388.5
Total liabilities	678.9	686.7
Total stockholders’ equity	1,093.7	1,084.2
Total	1,772.6	1,770.9
Parent
Current assets:
Cash and cash equivalents	5.0	5.0	5.0	5.0
Short-term investments	0	0
Receivables:
Trade, less allowance for doubtful receivables	0	0
Intercompany receivables	0	0
Other	0	0
Inventories	0	0
Prepaid expenses and other current assets	87.5	0.1
Total current assets	92.5	5.1
Investments in and advances to subsidiaries	1,505.4	1,437.9
Property, plant, and equipment – net	0	0
Long-term intercompany receivables	0	31.3
Net assets of VEBAs	0	0
Deferred tax assets — net	0	0
Intangible assets – net	0	0
Goodwill	0	0
Other assets	4.9	86.2
Total	1,602.8	1,560.5
Current liabilities:
Accounts payable	0.6	1.1
Intercompany payable	23.4	0
Accrued salaries, wages, and related expenses	0	0
Other accrued liabilities	92.2	3.5
Current portion of long-term debt	167.9
Short-term capital lease	0	0
Total current liabilities	284.1	4.6
Deferred tax liability	0	0
Long-term intercompany payable	0	0
Long-term liabilities	0	83.2
Long-term debt	225.0	388.5
Total liabilities	509.1	476.3
Total stockholders’ equity	1,093.7	1,084.2
Total	1,602.8	1,560.5
Guarantor Subsidiaries
Current assets:
Cash and cash equivalents	164.7	157.7	275.7	266.0
Short-term investments	127.2	129.5
Receivables:
Trade, less allowance for doubtful receivables	119.0	117.7
Intercompany receivables	26.1	0.1
Other	5.1	5.3
Inventories	193.8	208.6
Prepaid expenses and other current assets	47.6	43.7
Total current assets	683.5	662.6
Investments in and advances to subsidiaries	28.1	26.5
Property, plant, and equipment – net	425.9	414.0
Long-term intercompany receivables	0	1.6
Net assets of VEBAs	422.2	406.0
Deferred tax assets — net	36.9	60.2
Intangible assets – net	32.9	33.7
Goodwill	37.2	37.2
Other assets	19.0	18.5
Total	1,685.7	1,660.3
Current liabilities:
Accounts payable	64.2	56.3
Intercompany payable	8.5	13.9
Accrued salaries, wages, and related expenses	30.3	39.3
Other accrued liabilities	21.7	39.9
Current portion of long-term debt	0
Short-term capital lease	0.1	0.2
Total current liabilities	124.8	149.6
Deferred tax liability	0	0
Long-term intercompany payable	16.2	40.7
Long-term liabilities	52.7	52.0
Long-term debt	0	0
Total liabilities	193.7	242.3
Total stockholders’ equity	1,492.0	1,418.0
Total	1,685.7	1,660.3
Non-Guarantor Subsidiaries
Current assets:
Cash and cash equivalents	4.5	6.8	1.0	2.4
Short-term investments	0	0
Receivables:
Trade, less allowance for doubtful receivables	4.1	2.1
Intercompany receivables	0.7	0.2
Other	5.9	8.1
Inventories	5.1	6.4
Prepaid expenses and other current assets	0.4	0.4
Total current assets	20.7	24.0
Investments in and advances to subsidiaries	0	0
Property, plant, and equipment – net	15.5	15.3
Long-term intercompany receivables	16.2	9.5
Net assets of VEBAs	0	0
Deferred tax assets — net	0	0
Intangible assets – net	0	0
Goodwill	0	0
Other assets	0.1	0.1
Total	52.5	48.9
Current liabilities:
Accounts payable	7.3	5.5
Intercompany payable	2.0	0.1
Accrued salaries, wages, and related expenses	3.5	3.4
Other accrued liabilities	1.2	1.4
Current portion of long-term debt	0
Short-term capital lease	0	0
Total current liabilities	14.0	10.4
Deferred tax liability	1.2	1.2
Long-term intercompany payable	0	1.7
Long-term liabilities	11.0	11.2
Long-term debt	0	0
Total liabilities	26.2	24.5
Total stockholders’ equity	26.3	24.4
Total	52.5	48.9
Consolidating Adjustments
Current assets:
Cash and cash equivalents	0	0	0	0
Short-term investments	0	0
Receivables:
Trade, less allowance for doubtful receivables	0	0
Intercompany receivables	(26.8)	(0.3)
Other	0	0
Inventories	(0.8)	(0.6)
Prepaid expenses and other current assets	0	0
Total current assets	(27.6)	(0.9)
Investments in and advances to subsidiaries	(1,533.5)	(1,464.4)
Property, plant, and equipment – net	0	0
Long-term intercompany receivables	(16.2)	(42.4)
Net assets of VEBAs	0	0
Deferred tax assets — net	8.9	8.9
Intangible assets – net	0	0
Goodwill	0	0
Other assets	0	0
Total	(1,568.4)	(1,498.8)
Current liabilities:
Accounts payable	0	0
Intercompany payable	(33.9)	(14.0)
Accrued salaries, wages, and related expenses	0	0
Other accrued liabilities	0	0
Current portion of long-term debt	0
Short-term capital lease	0	0
Total current liabilities	(33.9)	(14.0)
Deferred tax liability	0	0
Long-term intercompany payable	(16.2)	(42.4)
Long-term liabilities	0	0
Long-term debt	0	0
Total liabilities	(50.1)	(56.4)
Total stockholders’ equity	(1,518.3)	(1,442.4)
Total	$ (1,568.4)	$ (1,498.8)