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Restatement of Previously Issued Financial Statements (Tables) | 3 Months Ended
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Mar. 31, 2012
Accounting Changes and Error Corrections [Abstract] |
Restatement of Previously Issued Financial Statements | The following is a summary of the effects of the restatement on the Company's Statements of Consolidated Income, Statements of Comprehensive Income and Statements of Cash Flows for the quarter ended March 31, 2011 (in millions of dollars, except per share amounts):
| Quarter ended March 31, 2011
| Previously Reported |  | Adjustment |  | Restated
Statements of Consolidated Income: |  |  |  |  |
Selling, administrative, research and development, and general | $ | 14.9 |  |  | $ | 0.7 |  |  | $ | 15.6 |
Total costs and expenses | 302.1 |  |  | 0.7 |  |  | 302.8 |
Operating income | 20.5 |  |  | (0.7 | ) |  | 19.8 |
Income before income taxes | 17.7 |  |  | (0.7 | ) |  | 17.0 |
Income tax provision | (6.4 | ) |  | 0.2 |  |  | (6.2 | )
Net income | $ | 11.3 |  |  | $ | (0.5 | ) |  | $ | 10.8 |
Earnings per common share, Basic: |  |  |  |  |
Net income per share | $ | 0.59 |  |  | $ | (0.02 | ) |  | $ | 0.57 |
Earnings per common share, Diluted: |  |  |  |  |
Net income per share | $ | 0.59 |  |  | $ | (0.02 | ) |  | $ | 0.57 |
Statements of Consolidated Comprehensive Income:1 |  |  |  |  |
Net income | $ | 11.3 |  |  | $ | (0.5 | ) |  | $ | 10.8 |
Other comprehensive income: |  |  |  |  |
Reclassification adjustments: |  |  |  |  |
Less: amortization of net actuarial loss | — |  |  | 0.1 |  |  | 0.1 |
Less: amortization of prior service cost | — |  |  | 1.0 |  |  | 1.0 |
Less: tax impact on amortization of prior service cost | — |  |  | (0.4 | ) |  | (0.4 | )
Other comprehensive (loss) income, net of tax | (0.3 | ) |  | 0.7 |  |  | 0.4 |
Comprehensive income | $ | 11.0 |  |  | $ | 0.2 |  |  | $ | 11.2 |
Statements of Consolidated Cash Flows: |  |  |  |  |
Net income | $ | 11.3 |  |  | $ | (0.5 | ) |  | $ | 10.8 |
Deferred income taxes | 6.1 |  |  | (0.3 | ) |  | 5.8 |
Non-cash net periodic benefit income 2 | — |  |  | (1.5 | ) |  | (1.5 | )
Other non-cash charges 2 | $ | (2.2 | ) |  | $ | 2.3 |  |  | $ | 0.1 |
______________________________
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 Tabular disclosure of prior period adjustments to previously issued financial statements including (1) the effect of the correction on each financial statement line item and any per-share amounts affected for each prior period presented (2) the cumulative effect of the change on retained earnings or other appropriate components of equity or net assets in the statement of financial position, as of the beginning of the earliest period presented, and (3) the effect of the prior period adjustments (both gross and net of applicable income tax) on the net income of each prior period presented in the entity's annual report for the year in which the adjustments are made. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6801783&loc=d3e22658-107794 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6801783&loc=d3e22663-107794 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 9 -Paragraph 26 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 154 -Paragraph 26 -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 FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6801783&loc=d3e22644-107794 + Details
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