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Guarantor and Non-Guarantor Financial Statements (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |  |
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Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012 | Mar. 31, 2013 Parent | Mar. 31, 2012 Parent | Dec. 31, 2012 Parent | Mar. 31, 2013 Guarantor Subsidiaries | Mar. 31, 2012 Guarantor Subsidiaries | Dec. 31, 2012 Guarantor Subsidiaries | Mar. 31, 2013 Non-Guarantor Subsidiaries | Mar. 31, 2012 Non-Guarantor Subsidiaries | Dec. 31, 2012 Non-Guarantor Subsidiaries | Mar. 31, 2013 Consolidating Adjustments | Mar. 31, 2012 Consolidating Adjustments | Dec. 31, 2012 Consolidating Adjustments | May 23, 2012 Senior Notes
Condensed Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes | $ 225.0 |  |  | $ 225.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 225.0
Ownership interest by parent | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 248.0 | 77.3 |  |  | 5.0 | 5.0 |  |  | 241.6 | 71.6 |  |  | 1.4 | 0.7 |  |  | 0 | 0 |  |  |
Short-term investments | 85.6 |  |  | 85.0 | 0 |  |  | 0 | 85.6 |  |  | 85.0 | 0 |  |  | 0 | 0 |  |  | 0 |
Receivables: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade, less allowance for doubtful receivables | 141.8 |  |  | 123.8 | 0 |  |  | 0 | 137.8 |  |  | 121.5 | 4.0 |  |  | 2.3 | 0 |  |  | 0 |
Intercompany receivables | 0 |  |  | 0 | 0 |  |  | 0 | 0.2 |  |  | (10.3) | 0.3 |  |  | 0.4 | (0.5) |  |  | 9.9 |
Other | 11.8 |  |  | 3.4 | 0 |  |  | 0 | 1.6 |  |  | 1.3 | 10.2 |  |  | 2.1 | 0 |  |  | 0 |
Inventories | 199.3 |  |  | 186.0 | 0 |  |  | 0 | 193.0 |  |  | 178.7 | 6.6 |  |  | 7.3 | (0.3) |  |  | 0 |
Prepaid expenses and other current assets | 71.0 |  |  | 70.1 | 0 |  |  | 0 | 68.9 |  |  | 68.1 | 2.1 |  |  | 2.0 | 0 |  |  | 0 |
Total current assets | 757.5 |  |  | 741.7 | 5.0 |  |  | 5.0 | 728.7 |  |  | 710.3 | 24.6 |  |  | 16.5 | (0.8) |  |  | 9.9 |
Investments in and advances to unconsolidated affiliates | 0 |  |  | 0 | 1,331.5 |  |  | 1,284.1 | 15.8 |  |  | 7.4 | 0 |  |  | 0 | (1,347.3) |  |  | (1,291.5) |
Property, plant, and equipment – net | 386.4 |  |  | 384.3 | 0 |  |  | 0 | 373.9 |  |  | 371.8 | 12.5 |  |  | 12.5 | 0 |  |  | 0 |
Long-term intercompany receivables | 0 |  |  | 0 | 140.4 |  |  | 163.7 | 0.9 |  |  | 0.4 | 8.9 |  |  | 6.4 | (150.2) |  |  | (170.5) |
Net asset in respect of VEBA | 372.5 |  |  | 365.9 | 0 |  |  | 0 | 372.5 |  |  | 365.9 | 0 |  |  | 0 | 0 |  |  | 0 |
Deferred tax assets — net | 87.0 |  |  | 102.0 | 0 |  |  | 0 | 78.7 |  |  | 93.4 | (1.0) |  |  | (0.8) | 9.3 |  |  | 9.4 |
Intangible assets – net | 35.0 |  |  | 35.4 | 0 |  |  | 0 | 35.0 |  |  | 35.4 | 0 |  |  | 0 | 0 |  |  | 0 |
Goodwill | 37.2 |  |  | 37.2 | 0 |  |  | 0 | 37.2 |  |  | 37.2 | 0 |  |  | 0 | 0 |  |  | 0 |
Other assets | 88.8 |  |  | 86.0 | 69.5 |  |  | 64.0 | 19.2 |  |  | 19.2 | 0.1 |  |  | 3.0 | 0 |  |  | (0.2) |
Total | 1,764.4 |  |  | 1,752.5 | 1,546.4 |  |  | 1,516.8 | 1,661.9 |  |  | 1,641.0 | 45.1 |  |  | 37.6 | (1,489.0) |  |  | (1,442.9) |
Current liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts payable | 73.2 |  |  | 62.5 | 1.5 |  |  | 0.1 | 64.7 |  |  | 56.5 | 7.0 |  |  | 5.9 | 0 |  |  | 0 |
Intercompany payable | 0 |  |  | 0 | 0 |  |  | 0 | 3.2 |  |  | 0.3 | 0.2 |  |  | 0.2 | (3.4) |  |  | (0.5) |
Accrued salaries, wages, and related expenses | 33.1 |  |  | 39.3 | 0 |  |  | 0 | 30.3 |  |  | 36.7 | 2.8 |  |  | 2.6 | 0 |  |  | 0 |
Other accrued liabilities | 38.4 |  |  | 51.8 | 10.1 |  |  | 3.5 | 27.0 |  |  | 47.8 | 1.3 |  |  | 0.5 | 0 |  |  | 0 |
Payable to affiliate | 12.3 |  |  | 7.9 | 0 |  |  | 0 | 12.3 |  |  | 7.9 | 0 |  |  | 0 | 0 |  |  | 0 |
Short-term capital lease | 0.2 |  |  | 0.1 | 0 |  |  | 0 | 0.2 |  |  | 0.1 | 0 |  |  | 0 | 0 |  |  | 0 |
Total current liabilities | 157.2 |  |  | 161.6 | 11.6 |  |  | 3.6 | 137.7 |  |  | 149.3 | 11.3 |  |  | 9.2 | (3.4) |  |  | (0.5) |
Net liability in respect of VEBA | 4.9 |  |  | 5.3 | 0 |  |  | 0 | 4.9 |  |  | 5.3 | 0 |  |  | 0 | 0 |  |  | 0 |
Long-term intercompany payable | 0 |  |  | 0 | 0 |  |  | 0 | 149.3 |  |  | 170.0 | 0.9 |  |  | 0.5 | (150.2) |  |  | (170.5) |
Long-term liabilities | 135.2 |  |  | 134.5 | 67.7 |  |  | 62.1 | 48.0 |  |  | 49.6 | 19.5 |  |  | 22.8 | 0 |  |  | 0 |
Long-term debt | 382.3 |  |  | 380.3 | 382.3 |  |  | 380.3 | 0 |  |  | 0 | 0 |  |  | 0 | 0 |  |  | 0 |
Total liabilities | 679.6 |  |  | 681.7 | 461.6 |  |  | 446.0 | 339.9 |  |  | 374.2 | 31.7 |  |  | 32.5 | (153.6) |  |  | (171.0) |
Total stockholders’ equity | 1,084.8 |  |  | 1,070.8 | 1,084.8 |  |  | 1,070.8 | 1,322.0 |  |  | 1,266.8 | 13.4 |  |  | 5.1 | (1,335.4) |  |  | (1,271.9) |
Total | 1,764.4 |  |  | 1,752.5 | 1,546.4 |  |  | 1,516.8 | 1,661.9 |  |  | 1,641.0 | 45.1 |  |  | 37.6 | (1,489.0) |  |  | (1,442.9) |
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | 337.4 | 365.4 |  |  | 0 | 0 |  |  | 331.8 | 355.5 |  |  | 30.4 | 32.6 |  |  | (24.8) | (22.7) |  |  |
Cost of products sold: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of products sold, excluding depreciation and amortization and other items | 263.6 | 298.1 |  |  | 0 | 0 |  |  | 259.7 | 290.5 |  |  | 27.0 | 29.9 |  |  | (23.1) | (22.3) |  |  |
Unrealized losses (gains) on derivative instruments | 0.7 | (3.1) |  |  | 0 | 0 |  |  | 0.7 | (3.1) |  |  | 0 | 0 |  |  | 0 | 0 |  |  |
Depreciation and amortization | 7.0 | 6.3 |  |  | 0 | 0 |  |  | 6.7 | 6.1 |  |  | 0.3 | 0.2 |  |  | 0 | 0 |  |  |
Selling, administrative, research and development, and general | 16.1 | 17.9 |  |  | 0.4 | 0.5 |  |  | 14.8 | 17.7 |  |  | 2.4 | 0 |  |  | (1.5) | (0.3) |  |  |
Total costs and expenses | 287.4 | 319.2 |  |  | 0.4 | 0.5 |  |  | 281.9 | 311.2 |  |  | 29.7 | 30.1 |  |  | (24.6) | (22.6) |  |  |
Operating (loss) income | 50.0 | 46.2 |  |  | (0.4) | (0.5) |  |  | 49.9 | 44.3 |  |  | 0.7 | 2.5 |  |  | (0.2) | (0.1) |  |  |
Other (expense) income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense | (9.3) | (4.1) |  |  | (9.1) | (4.0) |  |  | (0.3) | (0.1) |  |  | 0 | 0 |  |  | 0.1 | 0 |  |  |
Other income, net | 1.0 | 0.7 |  |  | 0.4 | 0.5 |  |  | 0.6 | 0.2 |  |  | 0.1 | 0 |  |  | (0.1) | 0 |  |  |
(Loss) income before income taxes | 41.7 | 42.8 |  |  | (9.1) | (4.0) |  |  | 50.2 | 44.4 |  |  | 0.8 | 2.5 |  |  | (0.2) | (0.1) |  |  |
Income tax (provision) benefit | (8.2) | (16.3) |  |  | 0 | 0 |  |  | (19.0) | (16.8) |  |  | 7.2 | (0.7) |  |  | 3.6 | 1.2 |  |  |
Earnings in equity of subsidiaries | 0 | 0 |  |  | 42.6 | 30.5 |  |  | 7.8 | 1.7 |  |  | 0 | 0 |  |  | (50.4) | (32.2) |  |  |
Net income | 33.5 | 26.5 |  |  | 33.5 | 26.5 |  |  | 39.0 | 29.3 |  |  | 8.0 | 1.8 |  |  | (47.0) | (31.1) |  |  |
Comprehensive income | 34.7 | 27.6 |  |  | 34.7 | 27.6 |  |  | 39.8 | 30.7 |  |  | 8.4 | 1.5 |  |  | (48.2) | (32.2) |  |  |
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash (used in) provided by operating activities | 6.3 | 35.0 | [1] |  | (0.5) | 0.1 | [1] |  | 5.4 | 36.0 | [1] |  | 1.4 | (1.1) | [1] |  | 0 | 0 | [1] |  |
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures | (9.3) | (9.0) |  |  | 0 | 0 |  |  | (9.0) | (8.7) |  |  | (0.3) | (0.3) |  |  | 0 | 0 |  |  |
Purchase of available for sale securities | (85.6) | 0 |  |  | 0 |  |  |  | (85.6) |  |  |  | 0 |  |  |  | 0 |  |  |  |
Proceeds from sale of available for sale securities | 85.2 | 0 |  |  | 0 |  |  |  | 85.2 |  |  |  | 0 |  |  |  | 0 |  |  |  |
Change in restricted cash | 0 | 7.2 |  |  |  | 6.9 |  |  |  | 0.3 |  |  |  | 0 |  |  |  | 0 |  |  |
Net cash used in investing activities | (9.7) | (1.8) |  |  | 0 | 6.9 |  |  | (9.4) | (8.4) |  |  | (0.3) | (0.3) |  |  | 0 | 0 |  |  |
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Excess tax benefit upon vesting of non-vested shares and dividend payment on unvested shares expected to vest | 0.8 | 1.3 |  |  | 0 | 0 |  |  | 0.8 | 1.3 |  |  | 0 | 0 |  |  | 0 | 0 |  |  |
Cancellation of shares to cover employees’ tax withholdings upon vesting of non-vested shares | (2.2) | (2.1) |  |  | (2.2) | (2.1) |  |  | 0 | 0 |  |  | 0 | 0 |  |  | 0 | 0 |  |  |
Cash dividend paid to stockholders | (5.9) | (4.9) |  |  | (5.9) | (4.9) |  |  | 0 | 0 |  |  | 0 | 0 |  |  | 0 | 0 |  |  |
Repurchase of common stock | (14.7) | 0 |  |  | (14.7) |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  |
Intercompany loan | 0 | 0 |  |  | 23.3 | 0 |  |  | (21.2) | (0.3) |  |  | (2.1) | 0.3 |  |  | 0 | 0 |  |  |
Net cash provided by (used in) financing activities | (22.0) | (5.7) |  |  | 0.5 | (7.0) |  |  | (20.4) | 1.0 |  |  | (2.1) | 0.3 |  |  | 0 | 0 |  |  |
Net (decrease) increase in cash and cash equivalents during the period | (25.4) | 27.5 |  |  | 0 | 0 |  |  | (24.4) | 28.6 |  |  | (1.0) | (1.1) |  |  | 0 | 0 |  |  |
Cash and cash equivalents at beginning of period | 273.4 | 49.8 |  |  | 5.0 | 5.0 |  |  | 266.0 | 43.0 |  |  | 2.4 | 1.8 |  |  | 0 | 0 |  |  |
Cash and cash equivalents at end of period | $ 248.0 | $ 77.3 |  |  | $ 5.0 | $ 5.0 |  |  | $ 241.6 | $ 71.6 |  |  | $ 1.4 | $ 0.7 |  |  | $ 0 | $ 0 |  |  |
[1] | The Company treats changes in long-term intercompany balances that relate to financing activities as cash flow from financing activities. In the above table, the Company has revised the previous classification of the changes in such intercompany balances during the quarter ended March 31, 2012 from cash flows from operating activities to a separate line item in cash flows from financing activities captioned "intercompany loan”.

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