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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