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Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income - Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 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 | $ 4,306.2 |  | 4,306.2 |  |
Reclassification Adjustment for Amounts Included in Net Income |  |  |  |  |
Reclassification Adjustment for Amounts Included in Net Income | (15.9) | $ (3.5) | (25.7) | $ (7.4) |
Income Tax Benefit (Expense) | 3.3 | 0.8 | 5.4 | 1.6 |
Net of Taxes | (12.6) | (2.7) | (20.3) | (5.8) |
Changes in Net Unrecognized Postretirement Benefit Costs |  |  |  |  |
Net Unrecognized Postretirement Benefit Costs | 0.1 | 0.7 | 0.4 | 1.4 |
Income Tax Benefit (Expense) | (0.1) | (0.1) | 0.4 | (0.3) |
Net of Taxes | 0.0 | 0.6 | 0.8 | 1.1 |
Changes in Gain (Loss) on Cash Flow Hedges |  |  |  |  |
Gain on Cash Flow Hedges | 0.1 | 0.0 | 0.2 | 0.1 |
Income Tax Benefit (Expense) | 0.0 | 0.0 | 0.0 | 0.0 |
Net of Taxes | 0.1 | 0.0 | 0.2 | 0.1 |
Total Other Comprehensive Income (Loss) Before Income Taxes | 190.7 | 408.0 | (175.0) | 204.0 |
Total Income Tax Benefit (Expense) | (38.2) | (85.6) | 37.5 | (42.8) |
Other Comprehensive Income (Loss), Net of Taxes | 152.5 | 322.4 | (137.5) | 161.2 |
Net Income | (62.6) | 126.1 | 60.6 | 190.1 |
Income Tax Benefit (Expense) | 27.1 | (33.6) | 28.7 | (47.3) |
Impairment Losses |  |  | (7.2) | (19.0) |
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 | 12.5 | 2.1 | 19.3 | 4.6 |
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 | 206.7 | 411.6 | (147.5) | 213.6 |
Income Tax Benefit (Expense) | (41.5) | (86.5) | 31.2 | (44.9) |
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax | 165.2 | 325.1 | (116.3) | 168.7 |
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 | (0.3) | (0.8) | (2.4) | (3.7) |
Income Tax Benefit (Expense) | 0.1 | 0.2 | 0.5 | 0.8 |
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax | (0.2) | (0.6) | (1.9) | (2.9) |
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 | 441.4 |  | 730.6 |  |
Other Comprehensive Income (Loss) Before Reclassification Adjustment, Net of Tax | 165.2 |  | (116.3) |  |
Reclassification Adjustment for Amounts Included in Net Income, Net of Tax | (12.6) |  | (20.3) |  |
Other Comprehensive Income (Loss), Net of Tax | 152.6 |  | (136.6) |  |
Balance at End of Period | 594.0 |  | 594.0 |  |
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 | 12.6 | 2.7 | 20.3 | 5.8 |
Income Tax Benefit (Expense) | (3.3) | (0.8) | (5.4) | (1.6) |
Net Realized Gains on Sales of Investments | 19.1 | 10.5 | 32.9 | 26.4 |
Impairment Losses | (3.2) | (7.0) | (7.2) | (19.0) |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest | 15.9 | 3.5 | 25.7 | 7.4 |
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 | (3.8) |  | (2.1) |  |
Other Comprehensive Income (Loss) Before Reclassification Adjustment, Net of Tax | (0.2) |  | (1.9) |  |
Reclassification Adjustment for Amounts Included in Net Income, Net of Tax | 0.0 |  | 0.0 |  |
Other Comprehensive Income (Loss), Net of Tax | (0.2) |  | (1.9) |  |
Balance at End of Period | (4.0) |  | (4.0) |  |
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |  |
Balance at Beginning of Period | (44.9) |  |  |  |
Other Comprehensive Income (Loss) Before Reclassification Adjustment, Net of Tax | 0.0 |  | 0.0 |  |
Reclassification Adjustment for Amounts Included in Net Income, Net of Tax |  |  | 0.8 |  |
Other Comprehensive Income (Loss), Net of Tax | 0.0 |  | 0.8 |  |
Balance at End of Period | (44.9) |  | (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 | 0.0 | (0.6) | (0.8) | (1.1) |
Interest and Other Expenses | (0.1) | (0.7) | (0.4) | (1.4) |
Income Tax Benefit (Expense) | (0.1) | 0.1 | (0.4) | 0.3 |
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |  |
Balance at Beginning of Period | (2.2) |  |  |  |
Other Comprehensive Income (Loss) Before Reclassification Adjustment, Net of Tax | 0.0 |  | 0.0 |  |
Reclassification Adjustment for Amounts Included in Net Income, Net of Tax | 0.1 |  | 0.2 |  |
Other Comprehensive Income (Loss), Net of Tax | 0.1 |  | 0.2 |  |
Balance at End of Period | (2.1) |  | (2.1) |  |
Accumulated Other Comprehensive Income |  |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |  |
Balance at Beginning of Period | 390.5 |  | 680.5 |  |
Other Comprehensive Income (Loss) Before Reclassification Adjustment, Net of Tax | 165.0 |  | (118.2) |  |
Reclassification Adjustment for Amounts Included in Net Income, Net of Tax | (12.5) |  | (19.3) |  |
Other Comprehensive Income (Loss), Net of Tax | 152.5 |  | (137.5) |  |
Balance at End of Period | 543.0 |  | 543.0 |  |
Changes in Gain (Loss) on Cash Flow Hedges |  |  |  |  |
Other Comprehensive Income (Loss), Net of Taxes | $ 152.5 | $ 322.4 | $ (137.5) | $ 161.2 |

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