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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Unrealized Holding Gains (Losses) Arising During the Period Before Reclassification Adjustment |  |  |  |
Unrealized Holding Gains (Losses) Arising During the Period Before Reclassification Adjustment | $ 96.9 | $ (233.8) | $ 221.3 | $ (257.7)
Reclassification Adjustment for Amounts Included in Net Income | 0.7 | (1.2) | (3.7) | (25.3)
Unrealized Holding Gains (Losses) | 97.6 | (235.0) | 217.6 | (283.0)
Foreign Currency Translation Adjustments | (0.2) | 0.1 | (0.2) | (0.1)
Amortization of Unrecognized Postretirement Benefit Costs | (1.9) | (6.7) | (3.9) | (12.1)
Other Comprehensive Income (Loss) Before Income Taxes | 99.3 | (228.2) | 221.3 | (271.0)
Other Comprehensive Income Tax Benefit (Expense): |  |  |  |
Unrealized Holding Gains and Losses Arising During the Period Before Reclassification Adjustment | (34.1) | 82.6 | (78.0) | 92.2
Reclassification Adjustment for Amounts Included in Net Income | (0.2) | 0.4 | 1.3 | 8.8
Unrealized Holding Gains and Losses | (34.3) | 83.0 | (76.7) | 101.0
Foreign Currency Translation Adjustment | 0.1 | (0.1) | 0.1 | 0
Amortization of Unrecognized Postretirement Benefit Costs | (0.7) | (2.3) | (1.4) | (4.2)
Other Comprehensive Income Tax Benefit (Expense) | $ 34.9 | $ (80.6) | $ 78.0 | $ (96.8)

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- Definition Amount of tax expense (benefit), 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 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e640-108580 + Details
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