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Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income - Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Unrealized Holding Gains (Losses) Arising During the Period Before Reclassification Adjustment |  |  |  |
Unrealized Holding Gains (Losses) Arising During the Period Before Reclassification Adjustment | $ (33.8) | $ 98.3 | $ (291.5) | $ 180.2
Reclassification Adjustment for Amounts Included in Net Income | 0.4 | (50.6) | (24.9) | (58.6)
Unrealized Holding Gains (Losses) | (33.4) | 47.7 | (316.4) | 121.6
Foreign Currency Translation Adjustments | 0.2 | 0.2 | 0.1 | 1.5
Amortization of Unrecognized Postretirement Benefit Costs | 6.3 | 4.4 | 18.4 | 12.0
Other Comprehensive Income (Loss) Before Income Taxes | (26.9) | 52.3 | (297.9) | 135.1
Other Comprehensive Income Tax Benefit (Expense): |  |  |  |
Unrealized Holding (Gains) Losses Arising During the Period Before Reclassification Adjustment | 11.9 | (34.8) | 104.1 | (63.8)
Reclassification Adjustment for Amounts Included in Net Income | (0.1) | 17.8 | 8.7 | 20.6
Unrealized Holding (Gains) Losses | 11.8 | (17.0) | 112.8 | (43.2)
Foreign Currency Translation Adjustment | 0 | (0.1) | 0 | (0.5)
Amortization of Unrecognized Postretirement Benefit Costs | (2.3) | (1.6) | (6.5) | (4.3)
Other Comprehensive Income Tax Benefit (Expense) | $ (9.5) | $ 18.7 | $ (106.3) | $ 48.0

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- Definition Amount before tax, after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669646-108580 + Details
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