Guarantor and Non-Guarantor Financial Statements, Balance Sheets (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 212.3	$ 169.5	$ 224.6	$ 273.4
Short-term investments	100.1	129.5
Receivables:
Trade, less allowance for doubtful receivables	132.4	119.8
Intercompany receivables	0	0
Other	10.4	13.4
Inventories	211.3	214.4
Prepaid expenses and other current assets	156.4	44.2
Total current assets	822.9	690.8
Investments in and advances to subsidiaries	0	0
Property, plant, and equipment – net	442.9	429.3
Long-term intercompany receivables	0	0
Net assets of VEBAs	430.3	406.0
Deferred tax assets — net	26.7	69.1
Intangible assets – net	32.5	33.7
Goodwill	37.2	37.2
Other assets	23.8	104.8
Total	1,816.3	1,770.9
Current liabilities:
Accounts payable	89.3	62.9
Intercompany payable	0	0
Accrued salaries, wages, and related expenses	37.2	42.7
Other accrued liabilities	131.7	44.8
Current portion of long-term debt	170.2	0
Short-term capital leases	0.1	0.2
Total current liabilities	428.5	150.6
Deferred tax liability	1.2	1.2
Long-term intercompany payable	0	0
Long-term liabilities	60.9	146.4
Long-term debt	225.0	388.5
Total liabilities	715.6	686.7
Total stockholders’ equity	1,100.7	1,084.2
Total	1,816.3	1,770.9
Parent
Current assets:
Cash and cash equivalents	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	100.1	0.1
Total current assets	100.1	5.1
Investments in and advances to subsidiaries	1,531.5	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	4.6	86.2
Total	1,636.2	1,560.5
Current liabilities:
Accounts payable	0.7	1.1
Intercompany payable	30.2	0
Accrued salaries, wages, and related expenses	0	0
Other accrued liabilities	109.4	3.5
Current portion of long-term debt	170.2
Short-term capital leases	0	0
Total current liabilities	310.5	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	535.5	476.3
Total stockholders’ equity	1,100.7	1,084.2
Total	1,636.2	1,560.5
Guarantor Subsidiaries
Current assets:
Cash and cash equivalents	208.6	157.7	217.1	266.0
Short-term investments	100.1	129.5
Receivables:
Trade, less allowance for doubtful receivables	128.0	117.7
Intercompany receivables	34.0	0.1
Other	5.1	5.3
Inventories	205.5	208.6
Prepaid expenses and other current assets	55.9	43.7
Total current assets	737.2	662.6
Investments in and advances to subsidiaries	29.6	26.5
Property, plant, and equipment – net	426.9	414.0
Long-term intercompany receivables	0	1.6
Net assets of VEBAs	430.3	406.0
Deferred tax assets — net	17.8	60.2
Intangible assets – net	32.5	33.7
Goodwill	37.2	37.2
Other assets	19.1	18.5
Total	1,730.6	1,660.3
Current liabilities:
Accounts payable	80.8	56.3
Intercompany payable	11.5	13.9
Accrued salaries, wages, and related expenses	33.7	39.3
Other accrued liabilities	22.1	39.9
Current portion of long-term debt	0
Short-term capital leases	0.1	0.2
Total current liabilities	148.2	149.6
Deferred tax liability	0	0
Long-term intercompany payable	16.5	40.7
Long-term liabilities	50.7	52.0
Long-term debt	0	0
Total liabilities	215.4	242.3
Total stockholders’ equity	1,515.2	1,418.0
Total	1,730.6	1,660.3
Non-Guarantor Subsidiaries
Current assets:
Cash and cash equivalents	3.7	6.8	2.5	2.4
Short-term investments	0	0
Receivables:
Trade, less allowance for doubtful receivables	4.4	2.1
Intercompany receivables	1.0	0.2
Other	5.3	8.1
Inventories	6.6	6.4
Prepaid expenses and other current assets	0.4	0.4
Total current assets	21.4	24.0
Investments in and advances to subsidiaries	0	0
Property, plant, and equipment – net	16.0	15.3
Long-term intercompany receivables	16.5	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	54.0	48.9
Current liabilities:
Accounts payable	7.8	5.5
Intercompany payable	3.1	0.1
Accrued salaries, wages, and related expenses	3.5	3.4
Other accrued liabilities	0.2	1.4
Current portion of long-term debt	0
Short-term capital leases	0	0
Total current liabilities	14.6	10.4
Deferred tax liability	1.2	1.2
Long-term intercompany payable	0	1.7
Long-term liabilities	10.2	11.2
Long-term debt	0	0
Total liabilities	26.0	24.5
Total stockholders’ equity	28.0	24.4
Total	54.0	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	(35.0)	(0.3)
Other	0	0
Inventories	(0.8)	(0.6)
Prepaid expenses and other current assets	0	0
Total current assets	(35.8)	(0.9)
Investments in and advances to subsidiaries	(1,561.1)	(1,464.4)
Property, plant, and equipment – net	0	0
Long-term intercompany receivables	(16.5)	(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	(1,604.5)	(1,498.8)
Current liabilities:
Accounts payable	0	0
Intercompany payable	(44.8)	(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 leases	0	0
Total current liabilities	(44.8)	(14.0)
Deferred tax liability	0	0
Long-term intercompany payable	(16.5)	(42.4)
Long-term liabilities	0	0
Long-term debt	0	0
Total liabilities	(61.3)	(56.4)
Total stockholders’ equity	(1,543.2)	(1,442.4)
Total	$ (1,604.5)	$ (1,498.8)