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Stockholders' Equity - Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Other Comprehensive Income (Loss)      
Other comprehensive income (loss), pre-tax $ 204.9 $ 1,949.6 $ (6,249.3)
Other comprehensive income (loss), tax (93.0) (415.8) 1,340.5
Other comprehensive income (loss) 111.9 1,533.8 (4,908.8)
Net unrealized gains (losses) on available-for-sale securities including NCI      
Other Comprehensive Income (Loss)      
Other comprehensive income (loss) before reclassifications, pre-tax (1,033.4) 1,986.8 (13,158.9)
Adjustments for assumed changes in amortization patterns, pre-tax 9.8 (2.6) (3.7)
Adjustments for assumed changes in policyholder liabilities, pre-tax 10.8 0.7 273.2
Other comprehensive income (loss), pre-tax (874.4) 2,336.0 (12,490.5)
Other comprehensive income (loss) before reclassifications, tax 227.0 (419.8) 2,787.9
Reclassification from accumulated other comprehensive income, tax (26.2) (73.5) (87.6)
Adjustments for assumed changes in amortization patterns, tax (2.1) 0.6 0.7
Adjustments for assumed changes in policyholder liabilities, tax (2.3) (0.2) (57.3)
Other comprehensive income (loss), tax 196.4 (492.9) 2,643.7
Other comprehensive income (loss) before reclassifications, after-tax (806.4) 1,567.0 (10,371.0)
Reclassification from accumulated other comprehensive income, after-tax 112.2 277.6 311.3
Adjustments for assumed changes in amortization patterns, after-tax 7.7 (2.0) (3.0)
Adjustments for assumed changes in policyholder liabilities, after-tax 8.5 0.5 215.9
Other comprehensive income (loss) (678.0) 1,843.1 (9,846.8)
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 138.4 351.1 398.9
Net unrealized gains (losses) on derivative instruments including NCI      
Other Comprehensive Income (Loss)      
Other comprehensive income (loss) before reclassifications, pre-tax 71.2 (44.9) (1.4)
Reclassification from accumulated other comprehensive income, pre-tax (3.5) (7.4) (28.0)
Adjustments for assumed changes in amortization patterns, pre-tax 0.5 (0.9) (0.1)
Adjustments for assumed changes in policyholder liabilities, pre-tax   0.2 0.4
Other comprehensive income (loss), pre-tax 68.2 (53.0) (29.1)
Other comprehensive income (loss) before reclassifications, tax (15.0) 9.4 0.3
Reclassification from accumulated other comprehensive income, tax 0.8 1.6 5.8
Adjustments for assumed changes in amortization patterns, tax (0.1) 0.2  
Adjustments for assumed changes in policyholder liabilities, tax     (0.1)
Other comprehensive income (loss), tax (14.3) 11.2 6.0
Other comprehensive income (loss) before reclassifications, after-tax 56.2 (35.5) (1.1)
Reclassification from accumulated other comprehensive income, after-tax (2.7) (5.8) (22.2)
Adjustments for assumed changes in amortization patterns, after-tax 0.4 (0.7) (0.1)
Adjustments for assumed changes in policyholder liabilities, after-tax   0.2 0.3
Other comprehensive income (loss) 53.9 (41.8) (23.1)
Liability for future policy benefits discount rate remeasurement gain (loss)      
Other Comprehensive Income (Loss)      
Other comprehensive income (loss), pre-tax 1,281.9 (365.9) 6,030.4
Other comprehensive income (loss), tax (271.9) 53.2 (1,251.9)
Other comprehensive income (loss) 1,010.0 (312.7) 4,778.5
Market risk benefit nonperformance risk remeasurement gain(loss)      
Other Comprehensive Income (Loss)      
Other comprehensive income (loss), pre-tax (10.3) (39.2) 144.3
Other comprehensive income (loss), tax 2.2 8.3 (30.2)
Other comprehensive income (loss) (8.1) (30.9) 114.1
Foreign currency translation adjustment including NCI      
Other Comprehensive Income (Loss)      
Other comprehensive income (loss) before reclassifications, pre-tax   68.0  
Reclassification from accumulated other comprehensive income, pre-tax   0.6  
Other comprehensive income (loss), pre-tax (301.5) 68.6 (26.9)
Other comprehensive income (loss) before reclassifications, tax   5.1  
Other comprehensive income (loss), tax 4.9 5.1 4.8
Other comprehensive income (loss) before reclassifications, after-tax   73.1  
Reclassification from accumulated other comprehensive income, after-tax   0.6  
Other comprehensive income (loss) (296.6) 73.7 (22.1)
Unrecognized postretirement benefit obligation including NCI      
Other Comprehensive Income (Loss)      
Other comprehensive income (loss) before reclassifications, pre-tax 20.7 (19.3) 85.8
Other comprehensive income (loss), pre-tax 41.0 3.1 122.5
Other comprehensive income (loss) before reclassifications, tax (5.1) 5.2 (22.3)
Reclassification from accumulated other comprehensive income, tax (5.2) (5.9) (9.6)
Other comprehensive income (loss), tax (10.3) (0.7) (31.9)
Other comprehensive income (loss) before reclassifications, after-tax 15.6 (14.1) 63.5
Reclassification from accumulated other comprehensive income, after-tax 15.1 16.5 27.1
Other comprehensive income (loss) 30.7 2.4 90.6
Unrecognized postretirement benefit obligation including NCI | Operating expense      
Other Comprehensive Income (Loss)      
Reclassification from accumulated other comprehensive income, pre-tax $ 20.3 $ 22.4 $ 36.7