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Schedule 2 - Parent Company Financial Statements - Statements of Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Income | $ 31.2 | $ (16.3) | $ 4.0 | $ (2.1) | $ 4.6 | $ 37.9 | $ 29.7 | $ 13.5 | $ 16.8 | $ 85.7 | $ 114.5
Unrealized Holding Gains (Losses) Arising During the Year: |  |  |  |  |  |  |  |  |  |  |
Securities Held by Parent |  |  |  |  |  |  |  |  | (2.4) | (151.9) | 259.7
Reclassification Adjustment for Amounts Included in Net Income: |  |  |  |  |  |  |  |  |  |  |
Securities Held by Parent |  |  |  |  |  |  |  |  | 0.2 | (25.4) | (25.1)
Unrealized Holding Gains (Losses) |  |  |  |  |  |  |  |  | (2.2) | (177.3) | 234.6
Unrecognized Postretirement Benefit Costs Arising During the Year |  |  |  |  |  |  |  |  | 14.2 | 3.0 | (106.4)
Other Comprehensive Income (Loss), Finalization of Pension and Other Postretirement Benefit Plan Valuation, before Tax |  |  |  |  |  |  |  |  | 1.0 | 0.0 | 0.0
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax |  |  |  |  |  |  |  |  | 6.3 | 23.1 | 7.9
Net Unrecognized Postretirement Benefit Costs |  |  |  |  |  |  |  |  | 20.5 | 26.1 | (98.5)
Foreign Currency Translation Adjustments |  |  |  |  |  |  |  |  | (0.3) | (1.4) | (1.0)
Reclassification Adjustment for Amounts Included in Net Income |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Foreign Currency Translation Adjustments |  |  |  |  |  |  |  |  | (0.3) | (1.4) | (1.0)
Gain on Cash Flow Hedge |  |  |  |  |  |  |  |  | 1.6 | 0.0 | 0.0
Other Comprehensive Income (Loss) Before Income Taxes |  |  |  |  |  |  |  |  | 19.6 | (152.6) | 135.1
Income Tax Benefit (Expense): |  |  |  |  |  |  |  |  |  |  |
Securities Held by Parent |  |  |  |  |  |  |  |  | 1.0 | 53.9 | (91.6)
Securities Held by Parent |  |  |  |  |  |  |  |  | (0.1) | 8.9 | 8.8
Unrealized Holding Gains and Losses |  |  |  |  |  |  |  |  | 0.9 | 62.8 | (82.8)
Unrecognized Postretirement Benefit Costs Arising During the Year |  |  |  |  |  |  |  |  | (5.0) | (1.1) | 37.5
Curtailment Cost Recognized |  |  |  |  |  |  |  |  | (0.4) | 0.0 | 0.0
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Tax |  |  |  |  |  |  |  |  | 2.3 | 8.0 | 2.8
Net Unrecognized Postretirement Benefit Costs |  |  |  |  |  |  |  |  | (7.3) | (9.1) | 34.7
Foreign Currency Translation Adjustments |  |  |  |  |  |  |  |  | 0.1 | 0.5 | 0.4
Reclassification Adjustment for Amounts Included in Net Income |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Foreign Currency Translation Adjustment |  |  |  |  |  |  |  |  | 0.1 | 0.5 | 0.4
Gain on Cash Flow Hedge |  |  |  |  |  |  |  |  | 0.6 | 0.0 | 0.0
Other Comprehensive Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  | (6.9) | 54.2 | (47.7)
Other Comprehensive Income (Loss), Net of Tax |  |  |  |  |  |  |  |  | 12.7 | (98.4) | 87.4
Total Comprehensive Income (Loss) |  |  |  |  |  |  |  |  | 29.5 | (12.7) | 201.9
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Income |  |  |  |  |  |  |  |  | 16.8 | 85.7 | 114.5
Unrealized Holding Gains (Losses) Arising During the Year: |  |  |  |  |  |  |  |  |  |  |
Securities Held by Subsidiaries |  |  |  |  |  |  |  |  | (2.6) | (150.4) | 261.7
Securities Held by Parent |  |  |  |  |  |  |  |  | 0.2 | (1.5) | (2.0)
Reclassification Adjustment for Amounts Included in Net Income: |  |  |  |  |  |  |  |  |  |  |
Securities Held by Subsidiaries |  |  |  |  |  |  |  |  | 0.2 | (26.9) | (26.8)
Securities Held by Parent |  |  |  |  |  |  |  |  | 0.0 | 1.5 | 1.7
Unrealized Holding Gains (Losses) |  |  |  |  |  |  |  |  | (2.2) | (177.3) | 234.6
Unrecognized Postretirement Benefit Costs Arising During the Year |  |  |  |  |  |  |  |  | 14.2 | 3.0 | (106.4)
Other Comprehensive Income (Loss), Finalization of Pension and Other Postretirement Benefit Plan Valuation, before Tax |  |  |  |  |  |  |  |  | 1.0 | 0.0 | 0.0
Amortization of Unrecognized Postretirement Benefit Costs |  |  |  |  |  |  |  |  | 5.3 | 23.1 | 7.9
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax |  |  |  |  |  |  |  |  | 6.3 | 23.1 | 7.9
Net Unrecognized Postretirement Benefit Costs |  |  |  |  |  |  |  |  | 20.5 | 26.1 | (98.5)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Held by Subsidiaries, before Tax |  |  |  |  |  |  |  |  | (0.3) | (1.4) | (1.0)
Gain on Cash Flow Hedge |  |  |  |  |  |  |  |  | 1.6 | 0.0 | 0.0
Other Comprehensive Income (Loss) Before Income Taxes |  |  |  |  |  |  |  |  | 19.6 | (152.6) | 135.1
Income Tax Benefit (Expense): |  |  |  |  |  |  |  |  |  |  |
Securities Held by Subsidiaries |  |  |  |  |  |  |  |  | 1.1 | 53.4 | (92.3)
Securities Held by Parent |  |  |  |  |  |  |  |  | (0.1) | 0.5 | 0.7
Securities Held by Subsidiaries |  |  |  |  |  |  |  |  | (0.1) | 9.4 | 9.4
Securities Held by Parent |  |  |  |  |  |  |  |  | 0.0 | (0.5) | (0.6)
Unrealized Holding Gains and Losses |  |  |  |  |  |  |  |  | 0.9 | 62.8 | (82.8)
Unrecognized Postretirement Benefit Costs Arising During the Year |  |  |  |  |  |  |  |  | (5.0) | (1.1) | 37.5
Curtailment Cost Recognized |  |  |  |  |  |  |  |  | (0.4) | 0.0 | 0.0
Amortization of Unrecognized Postretirement Benefit Costs |  |  |  |  |  |  |  |  | (1.9) | (8.0) | (2.8)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Tax |  |  |  |  |  |  |  |  | 2.3 | 8.0 | 2.8
Net Unrecognized Postretirement Benefit Costs |  |  |  |  |  |  |  |  | (7.3) | (9.1) | 34.7
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Held by Subsidiaries, Tax |  |  |  |  |  |  |  |  | 0.1 | 0.5 | 0.4
Gain on Cash Flow Hedge |  |  |  |  |  |  |  |  | 0.6 | 0.0 | 0.0
Other Comprehensive Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  | (6.9) | 54.2 | (47.7)
Other Comprehensive Income (Loss), Net of Tax |  |  |  |  |  |  |  |  | 12.7 | (98.4) | 87.4
Total Comprehensive Income (Loss) |  |  |  |  |  |  |  |  | $ 29.5 | $ (12.7) | $ 201.9

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