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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, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Income | $ 124.7 | $ 129.0 | $ 122.1 | $ 155.3 | $ 6.5 | $ 92.2 | $ 37.6 | $ 53.8 | $ 531.1 | $ 190.1 | $ 120.9
Unrealized Holding Gains (Losses) Arising During the Year: |  |  |  |  |  |  |  |  |  |  |
Unrealized Holding Gains (Losses) Arising During the Period Before Reclassification Adjustment |  |  |  |  |  |  |  |  | 433.4 | (214.2) | 119.1
Reclassification Adjustment for Amounts Included in Net Income: |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment for Amounts Included in Net Income |  |  |  |  |  |  |  |  | (28.1) | (21.9) | (35.3)
Unrealized Holding Gains (Losses) |  |  |  |  |  |  |  |  | 405.3 | (236.1) | 83.8
Unrecognized Postretirement Benefit Costs Arising During the Year |  |  |  |  |  |  |  |  | (4.8) | (8.0) | 3.9
Reclassification Adjustments for Amounts Included in Net Income: |  |  |  |  |  |  |  |  |  |  |
Total Reclassification Adjustments for Amounts Included in Net Income |  |  |  |  |  |  |  |  | (3.0) | 1.1 | (0.6)
Net Unrecognized Postretirement Benefit Costs |  |  |  |  |  |  |  |  | (7.8) | (6.9) | 3.3
Foreign Currency Translation Adjustments |  |  |  |  |  |  |  |  | 0.0 | 0.3 | 1.7
Gains (Losses) on Cash Flow Hedge |  |  |  |  |  |  |  |  | 0.4 | 1.2 | (6.7)
Other Comprehensive Income (Loss) Before Income Taxes |  |  |  |  |  |  |  |  | 397.9 | (241.5) | 82.1
Unrealized Holding Gains and Losses Arising During the Year: |  |  |  |  |  |  |  |  |  |  |
Unrealized Holding Gains (Losses) Arising During the Year Before Reclassification Adjustment |  |  |  |  |  |  |  |  | (91.0) | 45.0 | (38.2)
Reclassification Adjustment for Amounts Included in Net Income: |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment for Amounts Included in Net Income |  |  |  |  |  |  |  |  | (5.8) | (4.6) | (12.3)
Unrealized Holding Gains and Losses |  |  |  |  |  |  |  |  | (85.2) | 49.6 | (25.9)
Unrecognized Postretirement Benefit Costs Arising During the Year |  |  |  |  |  |  |  |  | 1.0 | 1.7 | (0.8)
Reclassification Adjustments for Amounts Included in Net Income: |  |  |  |  |  |  |  |  |  |  |
Total Reclassification Adjustments for Amounts Included in Net Income |  |  |  |  |  |  |  |  | 0.7 | (0.2) | 0.2
Net Unrecognized Postretirement Benefit Costs |  |  |  |  |  |  |  |  | 1.7 | 1.5 | (0.6)
Foreign Currency Translation Adjustments on Investments |  |  |  |  |  |  |  |  | 0.0 | (0.1) | (0.6)
Gains (Losses) on Cash Flow Hedge |  |  |  |  |  |  |  |  | (0.1) | (0.3) | 2.4
Other Comprehensive Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  | (83.6) | 50.7 | (24.7)
Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  | 314.3 | (190.8) | 57.4
Total Comprehensive Income (Loss) |  |  |  |  |  |  |  |  | 845.4 | (0.7) | 178.3
Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Unrealized Holding Gains (Losses) Arising During the Year: |  |  |  |  |  |  |  |  |  |  |
Unrealized Holding Gains (Losses) Arising During the Period Before Reclassification Adjustment |  |  |  |  |  |  |  |  | 433.2 | (214.1) | 119.5
Reclassification Adjustment for Amounts Included in Net Income: |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment for Amounts Included in Net Income |  |  |  |  |  |  |  |  | (27.9) | (21.9) | (35.3)
Unrecognized Postretirement Benefit Costs Arising During the Year |  |  |  |  |  |  |  |  | (0.6) | 0.0 | 0.0
Reclassification Adjustments for Amounts Included in Net Income: |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Translation Adjustments |  |  |  |  |  |  |  |  | 0.0 | 0.3 | 1.7
Unrealized Holding Gains and Losses Arising During the Year: |  |  |  |  |  |  |  |  |  |  |
Unrealized Holding Gains (Losses) Arising During the Year Before Reclassification Adjustment |  |  |  |  |  |  |  |  | (91.0) | 45.0 | (38.3)
Reclassification Adjustment for Amounts Included in Net Income: |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment for Amounts Included in Net Income |  |  |  |  |  |  |  |  | 5.8 | 4.6 | 12.3
Reclassification Adjustments for Amounts Included in Net Income: |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Translation Adjustments on Investments |  |  |  |  |  |  |  |  | 0.0 | (0.1) | (0.6)
Parent Company |  |  |  |  |  |  |  |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Income |  |  |  |  |  |  |  |  | 531.1 | 190.1 | 120.9
Unrealized Holding Gains (Losses) Arising During the Year: |  |  |  |  |  |  |  |  |  |  |
Unrealized Holding Gains (Losses) Arising During the Period Before Reclassification Adjustment |  |  |  |  |  |  |  |  | 0.2 | (0.1) | (0.4)
Reclassification Adjustment for Amounts Included in Net Income: |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment for Amounts Included in Net Income |  |  |  |  |  |  |  |  | (0.2) | 0.0 | 0.0
Unrealized Holding Gains (Losses) |  |  |  |  |  |  |  |  | 405.3 | (236.1) | 83.8
Unrecognized Postretirement Benefit Costs Arising During the Year |  |  |  |  |  |  |  |  | (4.2) | (8.0) | 3.9
Reclassification Adjustments for Amounts Included in Net Income: |  |  |  |  |  |  |  |  |  |  |
Amortization of Unrecognized Postretirement Benefits (Costs) |  |  |  |  |  |  |  |  | (3.0) | 1.1 | (0.6)
Total Reclassification Adjustments for Amounts Included in Net Income |  |  |  |  |  |  |  |  | (3.0) | 1.1 | (0.6)
Net Unrecognized Postretirement Benefit Costs |  |  |  |  |  |  |  |  | (7.8) | (6.9) | 3.3
Gains (Losses) on Cash Flow Hedge |  |  |  |  |  |  |  |  | 0.4 | 1.2 | (6.7)
Other Comprehensive Income (Loss) Before Income Taxes |  |  |  |  |  |  |  |  | 397.9 | (241.5) | 82.1
Unrealized Holding Gains and Losses Arising During the Year: |  |  |  |  |  |  |  |  |  |  |
Unrealized Holding Gains (Losses) Arising During the Year Before Reclassification Adjustment |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.1
Reclassification Adjustment for Amounts Included in Net Income: |  |  |  |  |  |  |  |  |  |  |
Unrealized Holding Gains and Losses |  |  |  |  |  |  |  |  | (85.2) | 49.6 | (25.9)
Unrecognized Postretirement Benefit Costs Arising During the Year |  |  |  |  |  |  |  |  | 1.0 | 1.7 | (0.8)
Reclassification Adjustments for Amounts Included in Net Income: |  |  |  |  |  |  |  |  |  |  |
Amortization of Unrecognized Postretirement Benefit Costs |  |  |  |  |  |  |  |  | 0.7 | (0.2) | 0.2
Total Reclassification Adjustments for Amounts Included in Net Income |  |  |  |  |  |  |  |  | 0.7 | (0.2) | 0.2
Net Unrecognized Postretirement Benefit Costs |  |  |  |  |  |  |  |  | 1.7 | 1.5 | (0.6)
Gains (Losses) on Cash Flow Hedge |  |  |  |  |  |  |  |  | (0.1) | (0.3) | 2.4
Other Comprehensive Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  | (83.6) | 50.7 | (24.7)
Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  | 314.3 | (190.8) | 57.4
Total Comprehensive Income (Loss) |  |  |  |  |  |  |  |  | $ 845.4 | $ (0.7) | $ 178.3

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- Definition Amount, before tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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