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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Income | $ 6.5 | $ 92.2 | $ 37.6 | $ 53.8 | $ 36.9 | $ 47.7 | $ 36.6 | $ (0.3) | $ 190.1 | $ 120.9 | $ 16.8
Unrealized Holding Gains (Losses) Arising During the Year: |  |  |  |  |  |  |  |  |  |  |
Securities Held by Parent |  |  |  |  |  |  |  |  | (214.2) | 119.1 | (2.4)
Reclassification Adjustment for Amounts Included in Net Income: |  |  |  |  |  |  |  |  |  |  |
Securities Held by Parent |  |  |  |  |  |  |  |  | (21.9) | (35.3) | 0.2
Unrealized Holding Gains (Losses) |  |  |  |  |  |  |  |  | (236.1) | 83.8 | (2.2)
Unrecognized Postretirement Benefit Costs Arising During the Year |  |  |  |  |  |  |  |  | (8.0) | 3.9 | 14.2
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 1.0
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax |  |  |  |  |  |  |  |  | 1.1 | (0.6) | 6.3
Net Unrecognized Postretirement Benefit Costs |  |  |  |  |  |  |  |  | (6.9) | 3.3 | 20.5
Foreign Currency Translation Adjustments |  |  |  |  |  |  |  |  | 0.0 | 1.7 | (0.3)
Reclassification Adjustment for Amounts Included in Net Income |  |  |  |  |  |  |  |  | (0.3) | 0.0 | 0.0
Gain on Cash Flow Hedge |  |  |  |  |  |  |  |  | 1.2 | (6.7) | 1.6
Other Comprehensive Income (Loss) Before Income Taxes |  |  |  |  |  |  |  |  | (241.5) | 82.1 | 19.6
Income Tax Benefit (Expense): |  |  |  |  |  |  |  |  |  |  |
Securities Held by Parent |  |  |  |  |  |  |  |  | 45.0 | (38.2) | 1.0
Securities Held by Parent |  |  |  |  |  |  |  |  | 4.6 | 12.3 | (0.1)
Unrealized Holding Gains and Losses |  |  |  |  |  |  |  |  | 49.6 | (25.9) | 0.9
Unrecognized Postretirement Benefit Costs Arising During the Year |  |  |  |  |  |  |  |  | 1.7 | (0.8) | (5.0)
Curtailment Cost Recognized |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.4
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax |  |  |  |  |  |  |  |  | (0.2) | 0.2 | (2.3)
Net Unrecognized Postretirement Benefit Costs |  |  |  |  |  |  |  |  | 1.5 | (0.6) | (7.3)
Foreign Currency Translation Adjustments |  |  |  |  |  |  |  |  | 0.0 | (0.6) | 0.1
Reclassification Adjustment for Amounts Included in Net Income |  |  |  |  |  |  |  |  | 0.1 | 0.0 | 0.0
Gain on Cash Flow Hedge |  |  |  |  |  |  |  |  | (0.3) | 2.4 | (0.6)
Other Comprehensive Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  | 50.7 | (24.7) | (6.9)
Other Comprehensive Income (Loss), Net of Tax |  |  |  |  |  |  |  |  | (190.8) | 57.4 | 12.7
Total Comprehensive Income (Loss) |  |  |  |  |  |  |  |  | (0.7) | 178.3 | 29.5
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Income |  |  |  |  |  |  |  |  | 190.1 | 120.9 | 16.8
Unrealized Holding Gains (Losses) Arising During the Year: |  |  |  |  |  |  |  |  |  |  |
Securities Held by Subsidiaries |  |  |  |  |  |  |  |  | (214.1) | 119.5 | (2.6)
Securities Held by Parent |  |  |  |  |  |  |  |  | (0.1) | (0.4) | 0.2
Reclassification Adjustment for Amounts Included in Net Income: |  |  |  |  |  |  |  |  |  |  |
Securities Held by Subsidiaries |  |  |  |  |  |  |  |  | (21.9) | (35.3) | 0.2
Securities Held by Parent |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Unrealized Holding Gains (Losses) |  |  |  |  |  |  |  |  | (236.1) | 83.8 | (2.2)
Unrecognized Postretirement Benefit Costs Arising During the Year |  |  |  |  |  |  |  |  | (8.0) | 3.9 | 14.2
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 1.0
Amortization of Unrecognized Postretirement Benefit Costs |  |  |  |  |  |  |  |  | 1.1 | (0.6) | 5.3
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax |  |  |  |  |  |  |  |  | 1.1 | (0.6) | 6.3
Net Unrecognized Postretirement Benefit Costs |  |  |  |  |  |  |  |  | (6.9) | 3.3 | 20.5
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Held by Subsidiaries, before Tax |  |  |  |  |  |  |  |  | 0.3 | 1.7 | (0.3)
Gain on Cash Flow Hedge |  |  |  |  |  |  |  |  | 1.2 | (6.7) | 1.6
Other Comprehensive Income (Loss) Before Income Taxes |  |  |  |  |  |  |  |  | (241.5) | 82.1 | 19.6
Income Tax Benefit (Expense): |  |  |  |  |  |  |  |  |  |  |
Securities Held by Subsidiaries |  |  |  |  |  |  |  |  | 45.0 | (38.3) | 1.1
Securities Held by Parent |  |  |  |  |  |  |  |  | 0.0 | 0.1 | (0.1)
Securities Held by Subsidiaries |  |  |  |  |  |  |  |  | 4.6 | 12.3 | (0.1)
Unrealized Holding Gains and Losses |  |  |  |  |  |  |  |  | 49.6 | (25.9) | 0.9
Unrecognized Postretirement Benefit Costs Arising During the Year |  |  |  |  |  |  |  |  | 1.7 | (0.8) | (5.0)
Curtailment Cost Recognized |  |  |  |  |  |  |  |  | 0.0 | 0.0 | (0.4)
Amortization of Unrecognized Postretirement Benefit Costs |  |  |  |  |  |  |  |  | (0.2) | 0.2 | (1.9)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax |  |  |  |  |  |  |  |  | (0.2) | 0.2 | (2.3)
Net Unrecognized Postretirement Benefit Costs |  |  |  |  |  |  |  |  | 1.5 | (0.6) | (7.3)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Held by Subsidiaries, Tax |  |  |  |  |  |  |  |  | (0.1) | (0.6) | 0.1
Gain on Cash Flow Hedge |  |  |  |  |  |  |  |  | (0.3) | 2.4 | (0.6)
Other Comprehensive Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  | 50.7 | (24.7) | (6.9)
Other Comprehensive Income (Loss), Net of Tax |  |  |  |  |  |  |  |  | (190.8) | 57.4 | 12.7
Total Comprehensive Income (Loss) |  |  |  |  |  |  |  |  | $ (0.7) | $ 178.3 | $ 29.5

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