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Schedule of Reclassifications from Accumulated Other Comprehensive Income to Income (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2013
Unrealized Gain on Securities Reclassified to Net Income |
Reclassification Adjustment for Sale of Securities Included in Net Income, Tax | $ 4.1
Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax | 7.8
Gain on Cash Flow Hedges Reclassified to Net Income |
Reclassification Adjustment on Derivatives Included in Net Income, before Tax | 1.2
Reclassification Adjustment on Derivatives Included in Net Income, Tax | 0.4
Cash Flow Hedge Gain Reclassified to Earnings, Net | 0.8
Unrecognized Pension and Postretirement Benefit Costs Reclassified to Net Income |
Total Pension and Other Postretirement Benefit Plans, Adjustment, before Tax | (13.7)
Reclassification Adjustment for Pension and Other Postretirement Benefit Plans, Net (Loss) Recognized in Net Periodic Benefit Cost, Tax | (4.7)
Reclassification Adjustment on Pension and Other Postretirement Benefit Plans, Net Loss Recognized in Net Periodic Benefit Cost, Net of Tax | (9.0)
Net Realized Investments Gain Loss [Member] |
Unrealized Gain on Securities Reclassified to Net Income |
Reclassification Adjustment for Sale of Securities Included in Net Income, before Tax | 11.9
Other Expense [Member] |
Unrecognized Pension and Postretirement Benefit Costs Reclassified to Net Income |
Reclassification Adjustment on Pension and Other Postretirement Benefit Plans for Amortization of Net Actuarial Loss, before Tax | (14.9)
Amortization of Pension and Other Postretirement Benefit Plans, Net Prior Service Cost Recognized in Net Periodic Benefit Cost, before Tax | 1.2
Interest Rate Swap [Member] |
Gain on Cash Flow Hedges Reclassified to Net Income |
Cash Flow Hedge Gain Reclassified to Net Investment Income | 10.0
Cash Flow Hedge Loss Reclassified to Interest and Debt Expense | (0.4)
Foreign Exchange Contract [Member] |
Gain on Cash Flow Hedges Reclassified to Net Income |
Cash Flow Hedge Gain Reclassified to Net Investment Income | (1.7)
Foreign Exchange Contract [Member] | Net Realized Investments Gain Loss [Member] |
Gain on Cash Flow Hedges Reclassified to Net Income |
Cash Flow Hedge Loss Reclassified to Earnings | $ (6.7)

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- Definition The amount of net gains or losses on a cash flow hedge reclassified in the period to earnings from accumulated other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7668309&loc=d3e80784-113994 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -Subparagraph b(1) -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. + Details
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