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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, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Income | $ 36.9 | $ 47.7 | $ 36.6 | $ (0.3) | $ 31.2 | $ (16.3) | $ 4.0 | $ (2.1) | $ 120.9 | $ 16.8 | $ 85.7
Unrealized Holding Gains (Losses) Arising During the Year: |  |  |  |  |  |  |  |  |  |  |
Securities Held by Parent |  |  |  |  |  |  |  |  | 119.1 | (2.4) | (151.9)
Reclassification Adjustment for Amounts Included in Net Income: |  |  |  |  |  |  |  |  |  |  |
Securities Held by Parent |  |  |  |  |  |  |  |  | (35.3) | 0.2 | (25.4)
Unrealized Holding Gains (Losses) |  |  |  |  |  |  |  |  | 83.8 | (2.2) | (177.3)
Unrecognized Postretirement Benefit Costs Arising During the Year |  |  |  |  |  |  |  |  | 3.9 | 14.2 | 3.0
Other Comprehensive Income (Loss), Finalization of Pension and Other Postretirement Benefit Plan Valuation, before Tax |  |  |  |  |  |  |  |  | 0.0 | 1.0 | 0.0
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax |  |  |  |  |  |  |  |  | (0.6) | 6.3 | 23.1
Net Unrecognized Postretirement Benefit Costs |  |  |  |  |  |  |  |  | 3.3 | 20.5 | 26.1
Foreign Currency Translation Adjustments |  |  |  |  |  |  |  |  | 1.7 | (0.3) | (1.4)
Reclassification Adjustment for Amounts Included in Net Income |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Gain on Cash Flow Hedge |  |  |  |  |  |  |  |  | (6.7) | 1.6 | 0.0
Other Comprehensive Income (Loss) Before Income Taxes |  |  |  |  |  |  |  |  | 82.1 | 19.6 | (152.6)
Income Tax Benefit (Expense): |  |  |  |  |  |  |  |  |  |  |
Securities Held by Parent |  |  |  |  |  |  |  |  | (38.2) | 1.0 | 53.9
Securities Held by Parent |  |  |  |  |  |  |  |  | 12.3 | (0.1) | 8.9
Unrealized Holding Gains and Losses |  |  |  |  |  |  |  |  | (25.9) | 0.9 | 62.8
Unrecognized Postretirement Benefit Costs Arising During the Year |  |  |  |  |  |  |  |  | (0.8) | (5.0) | (1.1)
Curtailment Cost Recognized |  |  |  |  |  |  |  |  | 0.0 | 0.4 | 0.0
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Tax |  |  |  |  |  |  |  |  | 0.2 | (2.3) | (8.0)
Net Unrecognized Postretirement Benefit Costs |  |  |  |  |  |  |  |  | (0.6) | (7.3) | (9.1)
Foreign Currency Translation Adjustments |  |  |  |  |  |  |  |  | (0.6) | 0.1 | 0.5
Reclassification Adjustment for Amounts Included in Net Income |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Gain on Cash Flow Hedge |  |  |  |  |  |  |  |  | 2.4 | (0.6) | 0.0
Other Comprehensive Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  | (24.7) | (6.9) | 54.2
Other Comprehensive Income (Loss), Net of Tax |  |  |  |  |  |  |  |  | 57.4 | 12.7 | (98.4)
Total Comprehensive Income (Loss) |  |  |  |  |  |  |  |  | 178.3 | 29.5 | (12.7)
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Income |  |  |  |  |  |  |  |  | 120.9 | 16.8 | 85.7
Unrealized Holding Gains (Losses) Arising During the Year: |  |  |  |  |  |  |  |  |  |  |
Securities Held by Subsidiaries |  |  |  |  |  |  |  |  | 119.5 | (2.6) | (150.4)
Securities Held by Parent |  |  |  |  |  |  |  |  | (0.4) | 0.2 | (1.5)
Reclassification Adjustment for Amounts Included in Net Income: |  |  |  |  |  |  |  |  |  |  |
Securities Held by Subsidiaries |  |  |  |  |  |  |  |  | (35.3) | 0.2 | (26.9)
Securities Held by Parent |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 1.5
Unrealized Holding Gains (Losses) |  |  |  |  |  |  |  |  | 83.8 | (2.2) | (177.3)
Unrecognized Postretirement Benefit Costs Arising During the Year |  |  |  |  |  |  |  |  | 3.9 | 14.2 | 3.0
Other Comprehensive Income (Loss), Finalization of Pension and Other Postretirement Benefit Plan Valuation, before Tax |  |  |  |  |  |  |  |  | 0.0 | 1.0 | 0.0
Amortization of Unrecognized Postretirement Benefit Costs |  |  |  |  |  |  |  |  | (0.6) | 5.3 | 23.1
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax |  |  |  |  |  |  |  |  | (0.6) | 6.3 | 23.1
Net Unrecognized Postretirement Benefit Costs |  |  |  |  |  |  |  |  | 3.3 | 20.5 | 26.1
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Held by Subsidiaries, before Tax |  |  |  |  |  |  |  |  | 1.7 | (0.3) | (1.4)
Gain on Cash Flow Hedge |  |  |  |  |  |  |  |  | (6.7) | 1.6 | 0.0
Other Comprehensive Income (Loss) Before Income Taxes |  |  |  |  |  |  |  |  | 82.1 | 19.6 | (152.6)
Income Tax Benefit (Expense): |  |  |  |  |  |  |  |  |  |  |
Securities Held by Subsidiaries |  |  |  |  |  |  |  |  | (38.3) | 1.1 | 53.4
Securities Held by Parent |  |  |  |  |  |  |  |  | 0.1 | (0.1) | 0.5
Securities Held by Subsidiaries |  |  |  |  |  |  |  |  | 12.3 | (0.1) | 9.4
Securities Held by Parent |  |  |  |  |  |  |  |  | 0.0 | 0.0 | (0.5)
Unrealized Holding Gains and Losses |  |  |  |  |  |  |  |  | (25.9) | 0.9 | 62.8
Unrecognized Postretirement Benefit Costs Arising During the Year |  |  |  |  |  |  |  |  | (0.8) | (5.0) | (1.1)
Curtailment Cost Recognized |  |  |  |  |  |  |  |  | 0.0 | (0.4) | 0.0
Amortization of Unrecognized Postretirement Benefit Costs |  |  |  |  |  |  |  |  | 0.2 | (1.9) | (8.0)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Tax |  |  |  |  |  |  |  |  | 0.2 | (2.3) | (8.0)
Net Unrecognized Postretirement Benefit Costs |  |  |  |  |  |  |  |  | (0.6) | (7.3) | (9.1)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Held by Subsidiaries, Tax |  |  |  |  |  |  |  |  | (0.6) | 0.1 | 0.5
Gain on Cash Flow Hedge |  |  |  |  |  |  |  |  | 2.4 | (0.6) | 0.0
Other Comprehensive Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  | (24.7) | (6.9) | 54.2
Other Comprehensive Income (Loss), Net of Tax |  |  |  |  |  |  |  |  | 57.4 | 12.7 | (98.4)
Total Comprehensive Income (Loss) |  |  |  |  |  |  |  |  | $ 178.3 | $ 29.5 | $ (12.7)

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