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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
CONSOLIDATED STATEMENTS OF OPERATIONS |  |  |
Net income (loss) | $ (1,200.6) | $ (491.1) | $ 7.5
Valuation gain (loss) for pension and postretirement health and life benefit plans (Note 12) | (55.1) | (136.2) | 33.5
Amortization of actuarial losses (Note 12) | 24.2 | 16.2 | 18.7
Amortization of prior service costs (credits) (Note 12) | 1.5 | 1.6 | (6.3)
Other comprehensive income (loss), pre-tax | (29.4) | (118.4) | 45.9
Valuation gain (loss) for pension and postretirement health and life benefit plans - tax (expense) benefit |  |  | (18.8)
Amortization of actuarial losses -tax (expense) benefit |  |  | (6.9)
Amortization of prior service costs (credits) - tax (expense) benefit |  |  | 3.1
Income tax (expense) benefit related to items of other comprehensive income (loss) |  |  | (22.6)
Other comprehensive income (loss), net of tax | (29.4) | (118.4) | 23.3
Comprehensive income (loss) | $ (1,230.0) | $ (609.5) | $ 30.8

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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 economic entity, including both controlling (parent) and noncontrolling interests. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, including 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-Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 29 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=18733213&loc=SL4591552-111686 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683 + Details
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