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Restatement of Previously Issued Financial Statements (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2012 | Mar. 31, 2011
Statements of Consolidated Income: |  |  |
Selling, administrative, research and development, and general | $ 17.9 | $ 15.6 |
Total costs and expenses | 319.2 | 302.8 |
Operating income | 46.2 | 19.8 |
Income before income taxes | 42.8 | 17.0 |
Income tax provision | (16.3) | (6.2) |
Net income | 26.5 | 10.8 | [1]
Earnings per common share, Basic: |  |  |
Net income per share (in dollars per share) | $ 1.39 | $ 0.57 |
Earnings per common share, Diluted: |  |  |
Net income per share (in dollars per share) | $ 1.38 | $ 0.57 |
Statements of Consolidated Comprehensive Income: |  |  |
Net income | 26.5 | 10.8 | [1]
Reclassification adjustments: |  |  |
Less: amortization of net actuarial loss | 0.8 | 0.1 | [1]
Less: amortization of prior service cost | 1.0 | 1.0 | [1]
Less: tax impact on amortization of prior service cost | (0.4) | (0.4) | [1]
Other comprehensive (loss) income, net of tax | 1.1 | 0.4 | [1]
Comprehensive income | 27.6 | 11.2 | [1]
Statements of Consolidated Cash Flows: |  |  |
Net income | 26.5 | 10.8 | [1]
Deferred income taxes | 16.0 | 5.8 |
Non-cash net periodic benefit income | (3.0) | (1.5) | [2]
Other non-cash charges | 0.8 | 0.1 | [2]
Previously Reported |  |  |
Statements of Consolidated Income: |  |  |
Selling, administrative, research and development, and general |  | 14.9 |
Total costs and expenses |  | 302.1 |
Operating income |  | 20.5 |
Income before income taxes |  | 17.7 |
Income tax provision |  | (6.4) |
Net income |  | 11.3 | [1]
Earnings per common share, Basic: |  |  |
Net income per share (in dollars per share) |  | $ 0.59 |
Earnings per common share, Diluted: |  |  |
Net income per share (in dollars per share) |  | $ 0.59 |
Statements of Consolidated Comprehensive Income: |  |  |
Net income |  | 11.3 | [1]
Reclassification adjustments: |  |  |
Less: amortization of net actuarial loss |  | 0 | [1]
Less: amortization of prior service cost |  | 0 | [1]
Less: tax impact on amortization of prior service cost |  | 0 | [1]
Other comprehensive (loss) income, net of tax |  | (0.3) | [1]
Comprehensive income |  | 11.0 | [1]
Statements of Consolidated Cash Flows: |  |  |
Net income |  | 11.3 | [1]
Deferred income taxes |  | 6.1 |
Non-cash net periodic benefit income |  | 0 | [2]
Other non-cash charges |  | (2.2) | [2]
Adjustment |  |  |
Statements of Consolidated Income: |  |  |
Selling, administrative, research and development, and general |  | 0.7 |
Total costs and expenses |  | 0.7 |
Operating income |  | (0.7) |
Income before income taxes |  | (0.7) |
Income tax provision |  | 0.2 |
Net income |  | (0.5) | [1]
Earnings per common share, Basic: |  |  |
Net income per share (in dollars per share) |  | $ (0.02) |
Earnings per common share, Diluted: |  |  |
Net income per share (in dollars per share) |  | $ (0.02) |
Statements of Consolidated Comprehensive Income: |  |  |
Net income |  | (0.5) | [1]
Reclassification adjustments: |  |  |
Less: amortization of net actuarial loss |  | 0.1 | [1]
Less: amortization of prior service cost |  | 1.0 | [1]
Less: tax impact on amortization of prior service cost |  | (0.4) | [1]
Other comprehensive (loss) income, net of tax |  | 0.7 | [1]
Comprehensive income |  | 0.2 | [1]
Statements of Consolidated Cash Flows: |  |  |
Net income |  | (0.5) | [1]
Deferred income taxes |  | (0.3) |
Non-cash net periodic benefit income |  | (1.5) | [2]
Other non-cash charges |  | $ 2.3 | [2]
[1] | Total comprehensive income and components of other comprehensive income (loss) were previously included in the Statement of Stockholders' Equity for interim reporting periods prior to 2012. The Company adopted ASU 2011-05 beginning with the annual period ended December 31, 2011 and presented the Statement of Comprehensive Income as its own separate statement. As such, the Previously Reported amounts in the tables above reflect the changes in the presentation.
[2] | Non-cash net periodic benefit cost was included within Other non-cash charges in the quarter ended March 31, 2011. Such amount has been reclassified from Other non-cash charges to conform to current period presentation.

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- Definition The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e540-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 30 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A5 -Appendix A Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(3) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 8, 9, 10, 11, 12, 13, 14 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6508144 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e557-108580 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 + Details
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