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Stockholders' Equity - Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Other Comprehensive Income (Loss)    
Other comprehensive income (loss), pre-tax $ 533.3 $ 153.2
Other comprehensive income (loss), tax (101.2) (65.8)
Other comprehensive income (loss) 432.1 87.4
Net unrealized gains (losses) on available-for-sale securities including NCI    
Other Comprehensive Income (Loss)    
Other comprehensive income (loss) before reclassifications, pre-tax 666.8 (507.7)
Adjustments for assumed changes in amortization patterns, pre-tax (0.4) (0.2)
Adjustments for assumed changes in policyholder liabilities, pre-tax 18.3 8.2
Other comprehensive income (loss), pre-tax 747.2 (456.2)
Other comprehensive income (loss) before reclassifications, tax (140.9) 108.3
Reclassification from accumulated other comprehensive income, tax (13.1) (9.0)
Adjustments for assumed changes in amortization patterns, tax 0.1  
Adjustments for assumed changes in policyholder liabilities, tax (3.9) (1.7)
Other comprehensive income (loss), tax (157.8) 97.6
Other comprehensive income (loss) before reclassifications, after-tax 525.9 (399.4)
Reclassification from accumulated other comprehensive income, after-tax 49.4 34.5
Adjustments for assumed changes in amortization patterns, after-tax (0.3) (0.2)
Adjustments for assumed changes in policyholder liabilities, after-tax 14.4 6.5
Other comprehensive income (loss) 589.4 (358.6)
Net unrealized gains (losses) on available-for-sale securities including NCI | Net realized capital gains (losses)    
Other Comprehensive Income (Loss)    
Reclassification from accumulated other comprehensive income, pre-tax 62.5 43.5
Net unrealized gains (losses) on derivative instruments including NCI    
Other Comprehensive Income (Loss)    
Other comprehensive income (loss) before reclassifications, pre-tax 18.5 23.1
Reclassification from accumulated other comprehensive income, pre-tax (0.6) (0.9)
Adjustments for assumed changes in amortization patterns, pre-tax   (0.1)
Other comprehensive income (loss), pre-tax 17.9 22.1
Other comprehensive income (loss) before reclassifications, tax (3.9) (4.8)
Reclassification from accumulated other comprehensive income, tax 0.1 0.2
Other comprehensive income (loss), tax (3.8) (4.6)
Other comprehensive income (loss) before reclassifications, after-tax 14.6 18.3
Reclassification from accumulated other comprehensive income, after-tax (0.5) (0.7)
Adjustments for assumed changes in amortization patterns, after-tax   (0.1)
Other comprehensive income (loss) 14.1 17.5
Liability for future policy benefits discount rate remeasurement gain (loss)    
Other Comprehensive Income (Loss)    
Other comprehensive income (loss), pre-tax (312.4) 710.2
Other comprehensive income (loss), tax 62.6 (155.5)
Other comprehensive income (loss) (249.8) 554.7
Market risk benefit nonperformance risk remeasurement gain(loss)    
Other Comprehensive Income (Loss)    
Other comprehensive income (loss), pre-tax 2.7 (11.0)
Other comprehensive income (loss), tax (0.6) 2.3
Other comprehensive income (loss) 2.1 (8.7)
Foreign currency translation adjustment including NCI    
Other Comprehensive Income (Loss)    
Other comprehensive income (loss), pre-tax 74.1 (116.7)
Other comprehensive income (loss), tax (0.7) (4.3)
Other comprehensive income (loss) 73.4 (121.0)
Unrecognized postretirement benefit obligation including NCI    
Other Comprehensive Income (Loss)    
Other comprehensive income (loss), pre-tax 3.8 4.8
Reclassification from accumulated other comprehensive income, tax (0.9) (1.3)
Other comprehensive income (loss), tax (0.9) (1.3)
Reclassification from accumulated other comprehensive income, after-tax 2.9 3.5
Other comprehensive income (loss) 2.9 3.5
Unrecognized postretirement benefit obligation including NCI | Operating expense    
Other Comprehensive Income (Loss)    
Reclassification from accumulated other comprehensive income, pre-tax $ 3.8 $ 4.8