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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, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Unrealized Holding Gains (Losses) Arising During the Period Before Reclassification Adjustment |  |  |  |
Unrealized Holding Gains (Losses) Arising During the Period Before Reclassification Adjustment | $ 7.2 | $ (33.8) | $ 228.5 | $ (291.5)
Reclassification Adjustment for Amounts Included in Net Income | (4.3) | 0.4 | (8.0) | (24.9)
Unrealized Holding Gains (Losses) | 2.9 | (33.4) | 220.5 | (316.4)
Foreign Currency Translation Adjustments | (0.5) | 0.2 | (0.7) | 0.1
Amortization of Unrecognized Postretirement Benefit Costs | (2.0) | (6.3) | (5.9) | (18.4)
Other Comprehensive Income (Loss) Before Income Taxes | 4.4 | (26.9) | 225.7 | (297.9)
Other Comprehensive Income Tax Benefit (Expense): |  |  |  |
Unrealized Holding Gains and Losses Arising During the Period Before Reclassification Adjustment | (2.6) | 11.9 | (80.6) | 104.1
Reclassification Adjustment for Amounts Included in Net Income | 1.5 | (0.1) | 2.8 | 8.7
Unrealized Holding Gains and Losses | (1.1) | 11.8 | (77.8) | 112.8
Foreign Currency Translation Adjustment | 0.2 | 0 | 0.3 | 0
Amortization of Unrecognized Postretirement Benefit Costs | (0.7) | (2.3) | (2.1) | (6.5)
Other Comprehensive Income Tax Benefit (Expense) | $ 1.6 | $ (9.5) | $ 79.6 | $ (106.3)

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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=36458714&loc=SL7669646-108580 + Details
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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=36458714&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=36458714&loc=d3e640-108580 + Details
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