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Schedule 2 - Parent Company Financial Statements - Statements of Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Income | $ 55.2 | $ 70.1 | $ 34.0 | $ 58.4 | $ 1.9 | $ 55.6 | $ 2.3 | $ 43.6 | $ 217.7 | $ 103.4 | $ 74.5
Unrealized Holding Gains (Losses) Arising During the Year: |  |  |  |  |  |  |  |  |  |  |
Securities Held by Parent |  |  |  |  |  |  |  |  | (324.9) | 157.9 | 232.1
Reclassification Adjustment for Amounts Included in Net Income: |  |  |  |  |  |  |  |  |  |  |
Securities Held by Parent |  |  |  |  |  |  |  |  | (37.9) | (61.2) | (30.9)
Unrealized Holding Gains (Losses) |  |  |  |  |  |  |  |  | 362.8 | (96.7) | (201.2)
Unrecognized Postretirement Benefit Costs Arising During the Year |  |  |  |  |  |  |  |  | 61.6 | (29.4) | (53.9)
Net Unrecognized Postretirement Benefit Costs |  |  |  |  |  |  |  |  | 86.6 | (13.2) | (45.2)
Foreign Currency Translation Adjustments |  |  |  |  |  |  |  |  | 0.2 | 1.6 | 0.4
Reclassification Adjustment for Amounts Included in Net Income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Foreign Currency Translation Adjustments |  |  |  |  |  |  |  |  | 0.2 | 1.6 | 0.4
Other Comprehensive Income (Loss) Before Income Taxes |  |  |  |  |  |  |  |  | (276.0) | 85.1 | 156.4
Income Tax Benefit (Expense): |  |  |  |  |  |  |  |  |  |  |
Securities Held by Parent |  |  |  |  |  |  |  |  | (115.9) | 55.9 | 82.5
Securities Held by Parent |  |  |  |  |  |  |  |  | (13.2) | (21.5) | (10.9)
Unrealized Holding Gains and Losses |  |  |  |  |  |  |  |  | 129.1 | (34.4) | (71.6)
Unrecognized Postretirement Benefit Costs Arising During the Year |  |  |  |  |  |  |  |  | (21.6) | 10.3 | 19.0
Net Unrecognized Postretirement Benefit Costs |  |  |  |  |  |  |  |  | (30.4) | 4.6 | 15.9
Foreign Currency Translation Adjustments |  |  |  |  |  |  |  |  | (0.1) | (0.6) | (0.1)
Reclassification Adjustment for Amounts Included in Net Income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Foreign Currency Translation Adjustment |  |  |  |  |  |  |  |  | (0.1) | (0.6) | (0.1)
Other Comprehensive Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  | 98.6 | (30.4) | (55.8)
Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  | (177.4) | 54.7 | 100.6
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Income |  |  |  |  |  |  |  |  | 217.7 | 103.4 | 74.5
Unrealized Holding Gains (Losses) Arising During the Year: |  |  |  |  |  |  |  |  |  |  |
Securities Held by Subsidiaries |  |  |  |  |  |  |  |  | (324.9) | 157.9 | 231.5
Securities Held by Parent |  |  |  |  |  |  |  |  | 0 | 0 | 0.6
Reclassification Adjustment for Amounts Included in Net Income: |  |  |  |  |  |  |  |  |  |  |
Securities Held by Subsidiaries |  |  |  |  |  |  |  |  | (37.9) | (61.2) | (30.2)
Securities Held by Parent |  |  |  |  |  |  |  |  | 0 | 0 | (0.7)
Unrealized Holding Gains (Losses) |  |  |  |  |  |  |  |  | 362.8 | (96.7) | (201.2)
Unrecognized Postretirement Benefit Costs Arising During the Year |  |  |  |  |  |  |  |  | 61.6 | (29.4) | (53.9)
Amortization of Unrecognized Postretirement Benefit Costs |  |  |  |  |  |  |  |  | 25.0 | 16.2 | 8.7
Net Unrecognized Postretirement Benefit Costs |  |  |  |  |  |  |  |  | 86.6 | (13.2) | (45.2)
Foreign Currency Translation Adjustments |  |  |  |  |  |  |  |  | 0.2 | 1.6 | 0.4
Reclassification Adjustment for Amounts Included in Net Income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Foreign Currency Translation Adjustments |  |  |  |  |  |  |  |  | 0.2 | 1.6 | 0.4
Other Comprehensive Income (Loss) Before Income Taxes |  |  |  |  |  |  |  |  | (276.0) | 85.1 | 156.4
Income Tax Benefit (Expense): |  |  |  |  |  |  |  |  |  |  |
Securities Held by Subsidiaries |  |  |  |  |  |  |  |  | 115.9 | (55.9) | (82.3)
Securities Held by Parent |  |  |  |  |  |  |  |  | 0 | 0 | 0.2
Securities Held by Subsidiaries |  |  |  |  |  |  |  |  | 13.2 | 21.5 | 10.7
Securities Held by Parent |  |  |  |  |  |  |  |  | 0 | 0 | (0.2)
Unrealized Holding Gains and Losses |  |  |  |  |  |  |  |  | 129.1 | (34.4) | (71.6)
Unrecognized Postretirement Benefit Costs Arising During the Year |  |  |  |  |  |  |  |  | (21.6) | 10.3 | 19.0
Amortization of Unrecognized Postretirement Benefit Costs |  |  |  |  |  |  |  |  | (8.8) | (5.7) | (3.1)
Net Unrecognized Postretirement Benefit Costs |  |  |  |  |  |  |  |  | (30.4) | 4.6 | 15.9
Foreign Currency Translation Adjustments |  |  |  |  |  |  |  |  | (0.1) | (0.6) | (0.1)
Reclassification Adjustment for Amounts Included in Net Income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Foreign Currency Translation Adjustment |  |  |  |  |  |  |  |  | (0.1) | (0.6) | (0.1)
Other Comprehensive Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  | 98.6 | (30.4) | (55.8)
Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  | (177.4) | 54.7 | 100.6
Total Comprehensive Income |  |  |  |  |  |  |  |  | $ 40.3 | $ 158.1 | $ 175.1

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- Definition Amount before tax of (increase) decrease in the value of the projected benefit obligation related to a change in an actuarial assumption and increase (decrease) in the value of the plan assets resulting from experience different from that assumed, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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