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Other Comprehensive Income (Loss) (Changes in Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Equity [Abstract] |  |  |  |
Net unrealized gains (losses) arising during period for those having no credit losses in Consolidated Statements of Income (Loss), Pre-Tax | $ 282.3 | $ (144.3) | $ 211.2 | $ (120.8)
Net unrealized gains (losses) arising during period for those having credit losses in Consolidated Statements of Income (Loss), Pre-Tax | 1.0 | (0.7) | 4.0 | 0.3
Amount of losses realized from sales and other recognized in Consolidated Statements of Income (Loss), Pre-Tax | 24.8 | 0.9 | 56.9 | 1.9
Amount of credit-related impairments (recoveries) recognized in the Consolidated Statement of Income (Loss), Pre-Tax | (0.3) | 0.0 | (0.7) | 0.8
Amount of additional impairment losses recognized in the Consolidated Statements of Income (Loss), Pre-Tax | 0.5 | 0.0 | 2.2 | 10.3
Net unrealized gains (losses), Pre-Tax | 308.3 | (144.1) | 273.6 | (107.5)
Amortization of net actuarial losses recognized as net periodic benefit cost, Pre-Tax | 1.7 | 1.9 | 5.1 | 5.9
Net change in market risk, Pre-tax | (4.0) | 4.2 | (1.7) | 3.3
Other comprehensive income (loss), Pre-Tax | 306.0 | (138.0) | 277.0 | (98.3)
Net unrealized gains (losses) arising during period for those having no credit losses in Consolidated Statements of Income (Loss), Tax Benefit (Expense) | (59.3) | 30.3 | (44.4) | 25.4
Net unrealized gains (losses) arising during period for those having credit losses in Consolidated Statements of Income (Loss), Tax Benefit (Expense) | (0.1) | 0.2 | (0.8) | 0.0
Amount of losses realized from sales and other recognized in Consolidated Statements of Income (Loss), Tax Benefit (Expense) | (5.8) | (0.6) | (13.1) | (1.6)
Amount of credit-related impairments (recoveries) recognized in the Consolidated Statement of Income (Loss), Tax Benefit (Expense) | 0.0 | 0.0 | 0.1 | (0.2)
Amount of additional impairment losses recognized in the Consolidated Statements of Income (Loss), Tax Benefit (Expense) | (0.1) | 0.0 | (0.5) | (2.2)
Net unrealized gains (losses), Tax Benefit (Expense) | (65.3) | 29.9 | (58.7) | 21.4
Amortization of net actuarial losses recognized as net periodic benefit cost, Tax Benefit (Expense) | (0.3) | (0.4) | (1.0) | (1.2)
Net change in market risk, Tax Benefit (Expense) | 0.9 | (0.9) | 0.4 | (0.7)
Other comprehensive income (loss), Tax Benefit (Expense) | (64.7) | 28.6 | (59.3) | 19.5
Net unrealized gains (losses) arising during period for those having no credit losses in Consolidated Statements of Income (Loss), Net of Tax | 223.0 | (114.0) | 166.8 | (95.4)
Net unrealized gains (losses) arising during period for those having credit losses in Consolidated Statements of Income (Loss), Net of Tax | 0.9 | (0.5) | 3.2 | 0.3
Amount of losses realized from sales and other recognized in Consolidated Statements of Income (Loss), Net of Tax | 19.0 | 0.3 | 43.8 | 0.3
Amount of credit-related impairments (recoveries) recognized in the Consolidated Statement of Income (Loss), Net of Tax | (0.3) | 0.0 | (0.6) | 0.6
Amount of additional impairment losses recognized in the Consolidated Statements of Income (Loss), Net of Tax | 0.4 | 0.0 | 1.7 | 8.1
Total available-for-sale securities | 243.0 | (114.2) | 214.9 | (86.1)
Amortization of net actuarial losses recognized as net periodic benefit cost, Net of Tax | 1.4 | 1.5 | 4.1 | 4.7
Net change in market risk, Net of Tax | (3.1) | 3.3 | (1.3) | 2.6
Other comprehensive income (loss), Net of tax | $ 241.3 | $ (109.4) | $ 217.7 | $ (78.8)

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Period Type: | duration