v3.25.1
Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income    
Net Investment Loss $ (206.8) $ (1.2)
Impairment Loss, Debt Securities, Available-for-sale [1] (152.4) 0.0
Credit Losses 1.0 0.0
Net Investment Income 513.2 513.5
Other Expenses (318.6) (291.1)
Income Tax Expense (Benefit) 54.5 100.5
Net Income 189.1 395.2
Reclassification out of Accumulated Other Comprehensive Income (Loss) | Net Unrealized Loss on Securities    
Reclassification Adjustment out of Accumulated Other Comprehensive Income    
Net Investment Loss (44.7) (15.8)
Impairment Loss, Debt Securities, Available-for-sale (152.4) 0.0
Credit Losses 1.0 0.0
Income Before Income Tax (198.1) (15.8)
Income Tax Expense (Benefit) (41.7) (3.4)
Net Income (156.4) (12.4)
Reclassification out of Accumulated Other Comprehensive Income (Loss) | Net Loss on Derivatives    
Reclassification Adjustment out of Accumulated Other Comprehensive Income    
Income Before Income Tax 2.5 5.6
Income Tax Expense (Benefit) 0.5 1.2
Net Income 2.0 4.4
Reclassification out of Accumulated Other Comprehensive Income (Loss) | Net Loss on Derivatives | Interest Rate Swaps    
Reclassification Adjustment out of Accumulated Other Comprehensive Income    
Net Investment Loss 0.4 0.0
Net Investment Income 2.2 5.8
Reclassification out of Accumulated Other Comprehensive Income (Loss) | Net Loss on Derivatives | Foreign Exchange Contracts    
Reclassification Adjustment out of Accumulated Other Comprehensive Income    
Net Investment Loss (0.1) (0.1)
Net Investment Income 0.0 (0.1)
Reclassification out of Accumulated Other Comprehensive Income (Loss) | Amortization of Net Actuarial Loss    
Reclassification Adjustment out of Accumulated Other Comprehensive Income    
Other Expenses (4.1) (4.2)
Reclassification out of Accumulated Other Comprehensive Income (Loss) | Amortization of Prior Service Credit    
Reclassification Adjustment out of Accumulated Other Comprehensive Income    
Other Expenses 0.1 0.1
Reclassification out of Accumulated Other Comprehensive Income (Loss) | Unrecognized Pension and Postretirement Benefit Costs    
Reclassification Adjustment out of Accumulated Other Comprehensive Income    
Income Before Income Tax (4.0) (4.1)
Income Tax Expense (Benefit) (0.8) (0.9)
Net Income $ (3.2) $ (3.2)
[1]
2During the three months ended March 31, 2025, we recognized a $152.4 million impairment loss based on the intent to dispose of fixed maturity securities with a fair value of $1,250.9 million related to an anticipated reinsurance transaction.