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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, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Income | $ 97.5 | $ 122.3 | $ 126.1 | $ 64.0 | $ 124.7 | $ 129.0 | $ 122.1 | $ 155.3 | $ 409.9 | $ 531.1 | $ 190.1
Reclassification Adjustment for Amounts Included in Net Income: |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment for Amounts Included in Net Income |  |  |  |  |  |  |  |  | 16.8 | 28.1 | (21.9)
Settlement Expense |  |  |  |  |  |  |  |  | 64.1 | 0.0 | 0.0
Reclassification Adjustments for Amounts Included in Net Income: |  |  |  |  |  |  |  |  |  |  |
Decrease (Increase) in Net Unrecognized Postretirement Benefit Costs |  |  |  |  |  |  |  |  | 70.2 | (7.8) | (6.9)
Foreign Currency Translation Adjustments |  |  |  |  |  |  |  |  |  |  | 0.3
Changes in Gain (Loss) on Cash Flow Hedges |  |  |  |  |  |  |  |  | 0.4 | 0.4 | 1.2
Other Comprehensive Income (Loss) Before Income Taxes |  |  |  |  |  |  |  |  | 437.9 | 397.9 | (241.5)
Reclassification Adjustment for Amounts Included in Net Income: |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment for Amounts Included in Net Income |  |  |  |  |  |  |  |  | 3.6 | 5.8 | 4.6
Unrealized Depreciation (Appreciation) on Securities |  |  |  |  |  |  |  |  | (78.3) | (85.2) | 49.6
Pension Settlement Cost Recognized |  |  |  |  |  |  |  |  | (13.5) | 0.0 | 0.0
Reclassification Adjustments for Amounts Included in Net Income: |  |  |  |  |  |  |  |  |  |  |
Net Unrecognized Postretirement Benefit Costs |  |  |  |  |  |  |  |  | (15.3) | 1.7 | 1.5
Foreign Currency Translation Adjustments on Investments |  |  |  |  |  |  |  |  | 0.0 | 0.0 | (0.1)
Changes in Gain (Loss) on Cash Flow Hedges |  |  |  |  |  |  |  |  | 0.0 | (0.1) | (0.3)
Other Comprehensive Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  | (93.5) | (83.6) | 50.7
Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  | 344.4 | 314.3 | (190.8)
Total Comprehensive Income (Loss) |  |  |  |  |  |  |  |  | 754.3 | 845.4 | (0.7)
No Credit Losses Recognized in Consolidated Statements of Income |  |  |  |  |  |  |  |  |  |  |
Changes in Net Unrealized Gains (Losses) on Investment Securities: |  |  |  |  |  |  |  |  |  |  |
Unrealized Holding Gains (Losses) Arising During the Period Before Reclassification Adjustment |  |  |  |  |  |  |  |  | 386.7 | 433.4 | (214.2)
Reclassification Adjustment for Amounts Included in Net Income: |  |  |  |  |  |  |  |  |  |  |
Changes in Net Unrealized Holding Gains (Losses) on Investment Securities |  |  |  |  |  |  |  |  | 369.9 | 405.3 | (236.1)
Reclassification Adjustments for Amounts Included in Net Income: |  |  |  |  |  |  |  |  |  |  |
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax |  |  |  |  |  |  |  |  | (82.3) | (91.0) | 45.0
Credit Losses Recognized in Consolidated Statements of Income |  |  |  |  |  |  |  |  |  |  |
Changes in Net Unrealized Gains (Losses) on Investment Securities: |  |  |  |  |  |  |  |  |  |  |
Unrealized Holding Gains (Losses) Arising During the Period Before Reclassification Adjustment |  |  |  |  |  |  |  |  | (2.6) | 0.0 | 0.0
Reclassification Adjustment for Amounts Included in Net Income: |  |  |  |  |  |  |  |  |  |  |
Changes in Net Unrealized Holding Gains (Losses) on Investment Securities |  |  |  |  |  |  |  |  | (2.6) |  |
Reclassification Adjustments for Amounts Included in Net Income: |  |  |  |  |  |  |  |  |  |  |
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax |  |  |  |  |  |  |  |  | 0.5 | 0.0 | 0.0
Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment for Amounts Included in Net Income: |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment for Amounts Included in Net Income |  |  |  |  |  |  |  |  | (16.6) | (27.9) | (21.9)
Unrecognized Postretirement Benefit Costs Arising During the Year |  |  |  |  |  |  |  |  | 0.0 | (0.6) | 0.0
Reclassification Adjustments for Amounts Included in Net Income: |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Translation Adjustments |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.3
Reclassification Adjustment for Amounts Included in Net Income: |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment for Amounts Included in Net Income |  |  |  |  |  |  |  |  | 3.5 | 5.8 | 4.6
Reclassification Adjustments for Amounts Included in Net Income: |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Translation Adjustments on Investments |  |  |  |  |  |  |  |  | 0.0 | 0.0 | (0.1)
Subsidiaries | No Credit Losses Recognized in Consolidated Statements of Income |  |  |  |  |  |  |  |  |  |  |
Changes in Net Unrealized Gains (Losses) on Investment Securities: |  |  |  |  |  |  |  |  |  |  |
Unrealized Holding Gains (Losses) Arising During the Period Before Reclassification Adjustment |  |  |  |  |  |  |  |  | 378.7 | 433.2 | (214.1)
Reclassification Adjustments for Amounts Included in Net Income: |  |  |  |  |  |  |  |  |  |  |
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax |  |  |  |  |  |  |  |  | (80.6) | (91.0) | 45.0
Subsidiaries | Credit Losses Recognized in Consolidated Statements of Income |  |  |  |  |  |  |  |  |  |  |
Changes in Net Unrealized Gains (Losses) on Investment Securities: |  |  |  |  |  |  |  |  |  |  |
Unrealized Holding Gains (Losses) Arising During the Period Before Reclassification Adjustment |  |  |  |  |  |  |  |  | (2.6) | 0.0 | 0.0
Reclassification Adjustments for Amounts Included in Net Income: |  |  |  |  |  |  |  |  |  |  |
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax |  |  |  |  |  |  |  |  | 0.5 | 0.0 | 0.0
Parent Company |  |  |  |  |  |  |  |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Income |  |  |  |  |  |  |  |  | 409.9 | 531.1 | 190.1
Reclassification Adjustment for Amounts Included in Net Income: |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment for Amounts Included in Net Income |  |  |  |  |  |  |  |  | (0.1) | (0.2) | 0.0
Unrecognized Postretirement Benefit Costs Arising During the Year |  |  |  |  |  |  |  |  | 3.6 | (4.2) | (8.0)
Settlement Expense |  |  |  |  |  |  |  |  | 64.1 | 0.0 | 0.0
Reclassification Adjustments for Amounts Included in Net Income: |  |  |  |  |  |  |  |  |  |  |
Amortization of Unrecognized Postretirement Benefits (Costs) |  |  |  |  |  |  |  |  | 2.5 | (3.0) | 1.1
Total Reclassification Adjustments for Amounts Included in Net Income |  |  |  |  |  |  |  |  | 66.6 | (3.0) | 1.1
Decrease (Increase) in Net Unrecognized Postretirement Benefit Costs |  |  |  |  |  |  |  |  | 70.2 | (7.8) | (6.9)
Changes in Gain (Loss) on Cash Flow Hedges |  |  |  |  |  |  |  |  | 0.4 | 0.4 | 1.2
Other Comprehensive Income (Loss) Before Income Taxes |  |  |  |  |  |  |  |  | 438.0 | 397.9 | (241.5)
Reclassification Adjustment for Amounts Included in Net Income: |  |  |  |  |  |  |  |  |  |  |
Unrecognized Postretirement Benefit Costs Arising During the Year |  |  |  |  |  |  |  |  | (1.3) | 1.0 | 1.7
Reclassification Adjustments for Amounts Included in Net Income: |  |  |  |  |  |  |  |  |  |  |
Amortization of Unrecognized Postretirement Benefit Costs |  |  |  |  |  |  |  |  | (0.5) | 0.7 | (0.2)
Net Unrecognized Postretirement Benefit Costs |  |  |  |  |  |  |  |  | (15.3) | 1.7 | 1.5
Changes in Gain (Loss) on Cash Flow Hedges |  |  |  |  |  |  |  |  | 0.0 | (0.1) | (0.3)
Other Comprehensive Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  | (93.6) | (83.6) | 50.7
Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  | 344.4 | 314.3 | (190.8)
Total Comprehensive Income (Loss) |  |  |  |  |  |  |  |  | 754.3 | 845.4 | (0.7)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax |  |  |  |  |  |  |  |  | (14.0) | 0.7 | (0.2)
Parent Company | No Credit Losses Recognized in Consolidated Statements of Income |  |  |  |  |  |  |  |  |  |  |
Changes in Net Unrealized Gains (Losses) on Investment Securities: |  |  |  |  |  |  |  |  |  |  |
Unrealized Holding Gains (Losses) Arising During the Period Before Reclassification Adjustment |  |  |  |  |  |  |  |  | 8.0 | 0.2 | (0.1)
Reclassification Adjustments for Amounts Included in Net Income: |  |  |  |  |  |  |  |  |  |  |
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax |  |  |  |  |  |  |  |  | $ (1.7) | $ 0.0 | $ 0.0

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