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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)