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Statements of Consolidated Comprehensive Income (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Net income | $ 9.1 | $ 29.2 | $ 21.0 | $ 26.5 | $ 6.1 | $ 4.1 | $ 4.1 | $ 10.8 | $ 85.8 | $ 25.1 | $ 12.0
Defined benefit pension plan and VEBAs |  |  |  |  |  |  |  |  |  |  |
Net actuarial gain (loss) arising during the period |  |  |  |  |  |  |  |  | 87.8 | (110.6) | 25.5
Reclassification adjustments relating to VEBAs: |  |  |  |  |  |  |  |  |  |  |
Amortization of net actuarial loss |  |  |  |  |  |  |  |  | 3.1 | 0.6 | 0.7
Amortization of prior service cost |  |  |  |  |  |  |  |  | 4.2 | 4.2 | 4.2
Other comprehensive income (loss) relating to defined benefit pension plan and VEBAs |  |  |  |  |  |  |  |  | 95.1 | (105.8) | 30.4
Unrealized gain (loss) on available for sale securities |  |  |  |  |  |  |  |  | 0.6 | (0.1) | 0.1
Foreign currency translation adjustment |  |  |  |  |  |  |  |  | (0.2) | 0.2 | (0.5)
Other comprehensive income (loss), before tax |  |  |  |  |  |  |  |  | 95.5 | (105.7) | 30.0
Income tax (expense) benefit related to items of other comprehensive income (loss) |  |  |  |  |  |  |  |  | (36.5) | 40.4 | (11.5)
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  | 59.0 | (65.3) | 18.5
Comprehensive income (loss) |  |  |  |  |  |  |  |  | $ 144.8 | $ (40.2) | $ 30.5

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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 -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 Reference 2: 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 3: 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 Reference 4: 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=16317811 Reference 6: 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=20435746&loc=d3e557-108580 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A5 -Appendix A + Details
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