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v3.21.1

Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income - Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |
Balance at Beginning of Period | $ 4,563.4 |  |
Balance at End of Period | 4,339.1 |  | $ 4,563.4
Reclassification Adjustment for Amounts Included in Net Income |  |  |
Reclassification Adjustment for Amounts Included in Net Income | (9.8) | $ (3.9) |
Income Tax Benefit (Expense) | 2.1 | 0.8 |
Net of Taxes | (7.7) | (3.1) |
Changes in Net Unrecognized Postretirement Benefit Costs |  |  |
Net Unrecognized Postretirement Benefit Costs | 0.3 | 0.7 |
Income Tax Benefit (Expense) | 0.5 | (0.2) |
Net of Taxes | 0.8 | 0.5 |
Changes in Gain (Loss) on Cash Flow Hedges |  |  |
Gain on Cash Flow Hedges | 0.1 | 0.1 |
Income Tax Benefit (Expense) | 0.0 | 0.0 |
Net of Taxes | 0.1 | 0.1 |
Total Other Comprehensive Income (Loss) Before Income Taxes | (365.7) | (204.0) |
Total Income Tax Benefit (Expense) | 75.7 | 42.8 |
Other Comprehensive Income (Loss), Net of Taxes | (290.0) | (161.2) |
Net Income | 123.2 | 64.0 |
Income Tax Benefit (Expense) | 1.6 | (13.7) |
Impairment Losses | (4.0) | (12.0) |
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax |  |  | (45.7)
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax |  |  | (2.3)
Reclassification out of Accumulated Other Comprehensive Income |  |  |
Changes in Gain (Loss) on Cash Flow Hedges |  |  |
Net Income | 6.8 | 2.4 |
No Credit Losses Recognized in Condensed Consolidated Statements of Income |  |  |
Changes in Net Unrealized Gains (Losses) on Investment Securities: |  |  |
Changes in Net Unrealized Gains (Losses) on Investment Securities | (354.2) | (198.0) |
Income Tax Benefit (Expense) | 72.7 | 41.6 |
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax | (281.5) | (156.4) |
Credit Losses Recognized in Condensed Consolidated Statements of Income |  |  |
Changes in Net Unrealized Gains (Losses) on Investment Securities: |  |  |
Changes in Net Unrealized Gains (Losses) on Investment Securities | (2.1) | (2.9) |
Income Tax Benefit (Expense) | 0.4 | 0.6 |
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax | (1.7) | (2.3) |
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |
Balance at Beginning of Period | 730.6 |  |
Other Comprehensive Income (Loss) Before Reclassification Adjustment, Net of Tax | (281.5) |  |
Reclassification Adjustment for Amounts Included in Net Income, Net of Tax | (7.7) |  |
Other Comprehensive Income (Loss), Net of Tax | (289.2) |  |
Balance at End of Period | 441.4 |  | 730.6
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Changes in Gain (Loss) on Cash Flow Hedges |  |  |
Net Income | 7.7 | 3.1 |
Income Tax Benefit (Expense) | (2.1) | (0.8) |
Net Realized Gains on Sales of Investments | 13.8 | 15.9 |
Impairment Losses | (4.0) | (12.0) |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest | 9.8 | 3.9 |
Accumulated Other-than-Temporary Impairment Attributable to Parent [Member] |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |
Balance at Beginning of Period | (2.1) |  |
Other Comprehensive Income (Loss) Before Reclassification Adjustment, Net of Tax | (1.7) |  |
Reclassification Adjustment for Amounts Included in Net Income, Net of Tax | 0.0 |  |
Other Comprehensive Income (Loss), Net of Tax | (1.7) |  |
Balance at End of Period | (3.8) |  | (2.1)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |
Other Comprehensive Income (Loss) Before Reclassification Adjustment, Net of Tax | 0.8 |  |
Other Comprehensive Income (Loss), Net of Tax | 0.8 |  |
Balance at End of Period | (44.9) |  |
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Changes in Gain (Loss) on Cash Flow Hedges |  |  |
Net Income | (0.8) | (0.6) |
Interest and Other Expenses | (0.3) | (0.7) |
Income Tax Benefit (Expense) | (0.5) | 0.1 |
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |
Other Comprehensive Income (Loss) Before Reclassification Adjustment, Net of Tax | 0.1 |  |
Other Comprehensive Income (Loss), Net of Tax | 0.1 |  |
Balance at End of Period | (2.2) |  |
Accumulated Other Comprehensive Income |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |
Balance at Beginning of Period | 680.5 |  |
Other Comprehensive Income (Loss) Before Reclassification Adjustment, Net of Tax | (282.3) |  |
Reclassification Adjustment for Amounts Included in Net Income, Net of Tax | (7.7) |  |
Other Comprehensive Income (Loss), Net of Tax | (290.0) |  |
Balance at End of Period | 390.5 |  | $ 680.5
Changes in Gain (Loss) on Cash Flow Hedges |  |  |
Other Comprehensive Income (Loss), Net of Taxes | $ (290.0) | $ (161.2) |

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