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Other Comprehensive Income (Changes in Other Comprehensive Income) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Net unrealized gains (losses) arising during period for those having no credit losses in Consolidated Statements of Income, Pre-Tax | $ 302.2 | $ (14.3) | $ 203.7
Net unrealized gains arising during period for those having credit losses in Consolidated Statements of Income, Pre-Tax | 0.1 | 0.8 | 3.7
Amount of losses realized from sales and other recognized in Consolidated Statements of Income, Pre-Tax | 61.9 | 88.4 | 9.1
Amount of credit-related (recoveries) impairments recognized in Consolidated Statements of Income, Pre-Tax | (0.3) | (0.5) | 0.8
Amount of additional impairment losses recognized in Consolidated Statements of Income, Pre-Tax | 0.7 | 2.2 | 10.3
Net unrealized gains, Pre-Tax | 364.6 | 76.6 | 227.6
Net gains (losses) arising in the period from net actuarial gains (losses), Pre-Tax | (5.5) | (7.3) | 3.9
Amortization of net actuarial losses recognized as net periodic benefit cost, Pre-Tax | 3,729.3 | 3,757.4 | 4,134.6
Total pension and postretirement benefits, Pre-Tax | 1.2 | (0.5) | 11.8
Net change in market risk, Pre-tax | (4.1) | 2.5 | (4.6)
Other comprehensive income, Pre-Tax | 361.7 | 78.6 | 234.8
Net unrealized gains (losses) arising during period for those having no credit losses in Consolidated Statements of Income, Tax Benefit (Expense) | (63.6) | 3.1 | (42.7)
Net unrealized gains arising during period for those having credit losses in Consolidated Statements of Income, Tax Benefit (Expense) | 0.0 | (0.2) | (0.7)
Amount of losses realized from sales and other recognized in Consolidated Statements of Income, Tax Benefit (Expense) | (13.8) | (19.8) | (3.2)
Amount of credit-related (recoveries) impairments recognized in Consolidated Statements of Income, Tax Benefit (Expense) | 0.1 | 0.1 | (0.2)
Amount of additional impairment losses recognized in Consolidated Statements of Income, Tax Benefit (Expense) | (0.1) | (0.5) | (2.2)
Net unrealized gains, Tax Benefit (Expense) | (77.4) | (17.3) | (49.0)
Net gains (losses) arising in the period from net actuarial gains (losses), Tax benefit (Expense) | 1.1 | 1.5 | (0.8)
Amortization of net actuarial losses recognized as net periodic benefit cost, Tax Benefit (Expense) | 183.1 | 112.5 | 7.6
Total pension and postretirement benefits, Tax Benefit (Expense) | (0.3) | 0.1 | (2.5)
Net change in market risk, Tax Benefit (Expense) | 0.9 | (0.5) | 1.0
Other comprehensive income, Tax Benefit (Expense) | (76.8) | (17.7) | (50.5)
Net unrealized gains (losses) arising during period for those having no credit losses in Consolidated Statements of Income, Net of Tax | 238.6 | (11.2) | 161.0
Net unrealized gains arising during period for those having credit losses in Consolidated Statements of Income, Net of Tax | 0.1 | 0.6 | 3.0
Amount of losses realized from sales and other recognized in Consolidated Statements of Income, Net of Tax | 48.1 | 68.6 | 5.9
Amount of credit-related (recoveries) impairments recognized in Consolidated Statements of Income, Net of Tax | (0.2) | (0.4) | 0.6
Amount of additional impairment losses recognized in Consolidated Statements of Income, Net Of Tax | 0.6 | 1.7 | 8.1
Total available-for-sale securities | 287.2 | 59.3 | 178.6
Net amount arising in the period | (4.4) | (5.8) | 3.1
Amortization of net actuarial losses recognized as net periodic benefit cost, Net of Tax | 660.7 | 425.3 | 33.5
Total pension and postretirement benefits | 0.9 | (0.4) | 9.3
Net change in market risk, Net of Tax | (3.2) | 2.0 | (3.6)
Total other comprehensive income, net of tax | 284.9 | 60.9 | 184.3
Defined Benefit Pension and Postretirement Plans [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Net amount arising in the period | (4.4) | (5.8) | 3.1
Defined Benefit Pension and Postretirement Plans [Member] | Reclassification out of Accumulated Other Comprehensive Loss [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amortization of net actuarial losses recognized as net periodic benefit cost, Pre-Tax | 6.7 | 6.8 | 7.9
Amortization of net actuarial losses recognized as net periodic benefit cost, Tax Benefit (Expense) | (1.4) | (1.4) | (1.7)
Amortization of net actuarial losses recognized as net periodic benefit cost, Net of Tax | $ 5.3 | $ 5.4 | $ 6.2

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