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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, 2014 | Mar. 31, 2013 | Dec. 31, 2013 | Mar. 31, 2014 Parent | Mar. 31, 2013 Parent | Dec. 31, 2013 Parent | Mar. 31, 2014 Guarantor Subsidiaries | Mar. 31, 2013 Guarantor Subsidiaries | Dec. 31, 2013 Guarantor Subsidiaries | Mar. 31, 2014 Non-Guarantor Subsidiaries | Mar. 31, 2013 Non-Guarantor Subsidiaries | Dec. 31, 2013 Non-Guarantor Subsidiaries | Mar. 31, 2014 Consolidating Adjustments | Mar. 31, 2013 Consolidating Adjustments | Dec. 31, 2013 Consolidating Adjustments | May 23, 2012 Senior Notes
Condensed Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 225.0
Ownership interest by parent | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 185.6 | 248.0 |  | 5.0 | 5.0 |  | 174.3 | 241.6 |  | 6.3 | 1.4 |  | 0 | 0 |  |
Short-term investments | 104.5 |  | 129.5 | 0 |  | 0 | 104.5 |  | 129.5 | 0 |  | 0 | 0 |  | 0 |
Receivables: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade, less allowance for doubtful receivables | 123.5 |  | 119.8 | 0 |  | 0 | 119.5 |  | 117.7 | 4.0 |  | 2.1 | 0 |  | 0 |
Intercompany receivables | 0 |  | 0 | 32.2 |  | 0 | 25.4 |  | 0.1 | 0.7 |  | 0.2 | (58.3) |  | (0.3) |
Other | 11.7 |  | 13.4 | 0 |  | 0 | 5.9 |  | 5.3 | 5.8 |  | 8.1 | 0 |  | 0 |
Inventories | 203.1 |  | 214.4 | 0 |  | 0 | 198.0 |  | 208.6 | 5.8 |  | 6.4 | (0.7) |  | (0.6) |
Prepaid expenses and other current assets | 48.6 |  | 44.2 | 0.1 |  | 0.1 | 48.0 |  | 43.7 | 0.5 |  | 0.4 | 0 |  | 0 |
Total current assets | 677.0 |  | 690.8 | 37.3 |  | 5.1 | 675.6 |  | 662.6 | 23.1 |  | 24.0 | (59.0) |  | (0.9) |
Investments in and advances to subsidiaries | 0 |  | 0 | 1,466.5 |  | 1,437.9 | 26.9 |  | 26.5 | 0 |  | 0 | (1,493.4) |  | (1,464.4) |
Property, plant, and equipment – net | 436.7 |  | 429.3 | 0 |  | 0 | 421.6 |  | 414.0 | 15.1 |  | 15.3 | 0 |  | 0 |
Long-term intercompany receivables | 0 |  | 0 | 0 |  | 31.3 | 1.1 |  | 1.6 | 10.6 |  | 9.5 | (11.7) |  | (42.4) |
Net asset of VEBAs | 414.1 |  | 406.0 | 0 |  | 0 | 414.1 |  | 406.0 | 0 |  | 0 | 0 |  | 0 |
Deferred tax assets — net | 59.2 |  | 69.1 | 0 |  | 0 | 50.2 |  | 60.2 | 0 |  | 0 | 9.0 |  | 8.9 |
Intangible assets – net | 33.3 |  | 33.7 | 0 |  | 0 | 33.3 |  | 33.7 | 0 |  | 0 | 0 |  | 0 |
Goodwill | 37.2 |  | 37.2 | 0 |  | 0 | 37.2 |  | 37.2 | 0 |  | 0 | 0 |  | 0 |
Other assets | 108.5 |  | 104.8 | 90.1 |  | 86.2 | 18.3 |  | 18.5 | 0.1 |  | 0.1 | 0 |  | 0 |
Total | 1,766.0 |  | 1,770.9 | 1,593.9 |  | 1,560.5 | 1,678.3 |  | 1,660.3 | 48.9 |  | 48.9 | (1,555.1) |  | (1,498.8) |
Current liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts payable | 72.3 |  | 62.9 | 0.4 |  | 1.1 | 66.6 |  | 56.3 | 5.3 |  | 5.5 | 0 |  | 0 |
Intercompany payable | 0 |  | 0 | 22.8 |  | 0 | 36.9 |  | 13.9 | 1.9 |  | 0.1 | (61.6) |  | (14.0) |
Accrued salaries, wages, and related expenses | 33.2 |  | 42.7 | 0 |  | 0 | 29.9 |  | 39.3 | 3.3 |  | 3.4 | 0 |  | 0 |
Other accrued liabilities | 37.1 |  | 44.8 | 10.1 |  | 3.5 | 25.8 |  | 39.9 | 1.2 |  | 1.4 | 0 |  | 0 |
Short-term capital lease | 0.2 |  | 0.2 | 0 |  | 0 | 0.2 |  | 0.2 | 0 |  | 0 | 0 |  | 0 |
Total current liabilities | 142.8 |  | 150.6 | 33.3 |  | 4.6 | 159.4 |  | 149.6 | 11.7 |  | 10.4 | (61.6) |  | (14.0) |
Deferred tax liability | 1.2 |  | 1.2 | 0 |  | 0 | 0 |  | 0 | 1.2 |  | 1.2 | 0 |  | 0 |
Long-term intercompany payable | 0 |  | 0 | 1.0 |  | 0 | 10.7 |  | 40.7 | 0 |  | 1.7 | (11.7) |  | (42.4) |
Long-term liabilities | 149.0 |  | 146.4 | 86.6 |  | 83.2 | 51.3 |  | 52.0 | 11.1 |  | 11.2 | 0 |  | 0 |
Long-term debt | 390.7 |  | 388.5 | 390.7 |  | 388.5 | 0 |  | 0 | 0 |  | 0 | 0 |  | 0 |
Total liabilities | 683.7 |  | 686.7 | 511.6 |  | 476.3 | 221.4 |  | 242.3 | 24.0 |  | 24.5 | (73.3) |  | (56.4) |
Total stockholders’ equity | 1,082.3 |  | 1,084.2 | 1,082.3 |  | 1,084.2 | 1,456.9 |  | 1,418.0 | 24.9 |  | 24.4 | (1,481.8) |  | (1,442.4) |
Total | 1,766.0 |  | 1,770.9 | 1,593.9 |  | 1,560.5 | 1,678.3 |  | 1,660.3 | 48.9 |  | 48.9 | (1,555.1) |  | (1,498.8) |
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | 335.1 | 337.4 |  | 0 | 0 |  | 327.1 | 331.8 |  | 33.1 | 30.4 |  | (25.1) | (24.8) |  |
Cost of products sold: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of products sold, excluding depreciation and amortization and other items | 282.9 | 263.6 |  | 0 | 0 |  | 278.9 | 259.7 |  | 28.4 | 27.0 |  | (24.4) | (23.1) |  |
Unrealized (gains) losses on derivative instruments | (2.0) | 0.7 |  | 0 | 0 |  | (2.0) | 0.7 |  | 0 | 0 |  | 0 | 0 |  |
Depreciation and amortization | 7.4 | 7.0 |  | 0 | 0 |  | 7.1 | 6.7 |  | 0.3 | 0.3 |  | 0 | 0 |  |
Selling, administrative, research and development, and general | 20.3 | 21.7 |  | 1.0 | 0.4 |  | 16.6 | 20.4 |  | 3.3 | 2.4 |  | (0.6) | (1.5) |  |
Net periodic pension benefit income relating to VEBAs | (5.6) | (5.6) |  | 0 | 0 |  | (5.6) | (5.6) |  | 0 | 0 |  | 0 | 0 |  |
Total selling, administrative, research and development, and general | 14.7 | 16.1 |  | 1.0 | 0.4 |  | 11.0 | 14.8 |  | 3.3 | 2.4 |  | (0.6) | (1.5) |  |
Total costs and expenses | 303.0 | 287.4 |  | 1.0 | 0.4 |  | 295.0 | 281.9 |  | 32.0 | 29.7 |  | (25.0) | (24.6) |  |
Operating (loss) income | 32.1 | 50.0 |  | (1.0) | (0.4) |  | 32.1 | 49.9 |  | 1.1 | 0.7 |  | (0.1) | (0.2) |  |
Other (expense) income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest (expense) income | (8.8) | (9.3) |  | (9.3) | (9.1) |  | 0.4 | (0.3) |  | 0 | 0 |  | 0.1 | 0.1 |  |
Other income, net | 1.9 | 1.0 |  | 1.0 | 0.4 |  | 1.2 | 0.6 |  | (0.2) | 0.1 |  | (0.1) | (0.1) |  |
(Loss) income before income taxes | 25.2 | 41.7 |  | (9.3) | (9.1) |  | 33.7 | 50.2 |  | 0.9 | 0.8 |  | (0.1) | (0.2) |  |
Income tax (provision) benefit | (9.4) | (8.2) |  | 0 | 0 |  | (12.6) | (19.0) |  | (0.3) | 7.2 |  | 3.5 | 3.6 |  |
Earnings in equity of subsidiaries | 0 | 0 |  | 25.1 | 42.6 |  | 0.4 | 7.8 |  | 0 | 0 |  | (25.5) | (50.4) |  |
Net income | 15.8 | 33.5 |  | 15.8 | 33.5 |  | 21.5 | 39.0 |  | 0.6 | 8.0 |  | (22.1) | (47.0) |  |
Comprehensive income | 16.7 | 34.7 |  | 16.7 | 34.7 |  | 22.2 | 39.8 |  | 0.8 | 8.4 |  | (23.0) | (48.2) |  |
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash (used in) provided by operating activities | 27.1 | 6.3 |  | (11.0) | (0.5) |  | 35.8 | 5.4 |  | 2.3 | 1.4 |  | 0 | 0 |  |
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures | (15.4) | (9.3) |  | 0 | 0 |  | (15.4) | (9.0) |  | 0 | (0.3) |  | 0 | 0 |  |
Purchase of available for sale securities | 0 | (85.6) |  |  | 0 |  |  | (85.6) |  |  | 0 |  |  | 0 |  |
Proceeds from disposition of available for sale securities | 25.0 | 85.2 |  | 0 | 0 |  | 25.0 | 85.2 |  | 0 | 0 |  | 0 | 0 |  |
Net cash provided by (used in) investing activities | 9.6 | (9.7) |  | 0 | 0 |  | 9.6 | (9.4) |  | 0 | (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 | 0.7 | 0.8 |  | 0 | 0 |  | 0.7 | 0.8 |  | 0 | 0 |  | 0 | 0 |  |
Cancellation of shares to cover employees’ tax withholdings upon vesting of non-vested shares | (2.2) | (2.2) |  | (2.2) | (2.2) |  | 0 | 0 |  | 0 | 0 |  | 0 | 0 |  |
Cash dividend paid to stockholders | (6.4) | (5.9) |  | (6.4) | (5.9) |  | 0 | 0 |  | 0 | 0 |  | 0 | 0 |  |
Repurchase of common stock | (12.7) | (14.7) |  | (12.7) | (14.7) |  | 0 | 0 |  | 0 | 0 |  | 0 | 0 |  |
Intercompany loan | 0 | 0 |  | 32.3 | 23.3 |  | (29.5) | (21.2) |  | (2.8) | (2.1) |  | 0 | 0 |  |
Net cash provided by (used in) financing activities | (20.6) | (22.0) |  | 11.0 | 0.5 |  | (28.8) | (20.4) |  | (2.8) | (2.1) |  | 0 | 0 |  |
Net increase (decrease) in cash and cash equivalents during the period | 16.1 | (25.4) |  | 0 | 0 |  | 16.6 | (24.4) |  | (0.5) | (1.0) |  | 0 | 0 |  |
Cash and cash equivalents at beginning of period | 169.5 | 273.4 |  | 5.0 | 5.0 |  | 157.7 | 266.0 |  | 6.8 | 2.4 |  | 0 | 0 |  |
Cash and cash equivalents at end of period | $ 185.6 | $ 248.0 |  | $ 5.0 | $ 5.0 |  | $ 174.3 | $ 241.6 |  | $ 6.3 | $ 1.4 |  | $ 0 | $ 0 |  |

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