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Segment Information - Reconciliation of Segment Expenses (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]        
Benefits, claims and settlement expenses $ 1,964.1 $ 1,778.1 $ 6,024.0 $ 5,925.7
Liability for future policy benefit remeasurement (gain) loss (60.9) (122.5) (58.8) (565.6)
Market risk benefit remeasurement (gain) loss (4.0) (54.0) (53.0) (39.1)
Dividends to policyholders 30.0 14.9 72.0 68.1
Operating expenses 1,374.2 1,335.9 4,060.6 4,000.0
Total expenses 3,433.2 3,305.4 10,268.4 10,598.5
Operating Segments        
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]        
Total segment expenses 3,315.9 3,158.1 9,932.7 10,073.1
Operating Segments | Retirement and Income Solutions        
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]        
Benefits, claims and settlement expenses 1,144.0 984.6 3,504.1 3,718.7
Liability for future policy benefit remeasurement (gain) loss (10.5) (2.4) (18.9) (5.2)
Market risk benefit remeasurement (gain) loss 0.9 24.8 4.6 27.8
Dividends to policyholders 0.1   0.1 0.1
Commission expense 74.9 74.2 216.9 194.9
Capitalization of deferred acquisition costs and contract costs (41.1) (44.3) (122.5) (102.0)
Amortization of deferred acquisition costs and contract costs 21.8 19.8 64.0 59.9
Depreciation and amortization 18.3 20.6 56.4 60.9
Compensation and other 367.4 363.0 1,088.2 1,081.9
Operating expenses 441.3 433.3 1,303.0 1,295.6
Total segment expenses 1,575.8 1,440.3 4,792.9 5,037.0
Operating Segments | Principal Asset Management        
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]        
Benefits, claims and settlement expenses 60.9 81.8 233.7 260.1
Liability for future policy benefit remeasurement (gain) loss (0.8) 0.2 (0.9) 0.1
Commission expense 50.9 48.1 147.2 138.8
Capitalization of deferred acquisition costs and contract costs (9.7) (8.1) (25.8) (20.6)
Amortization of deferred acquisition costs and contract costs 12.7 8.3 24.9 25.2
Depreciation and amortization 13.7 16.4 41.5 50.2
Interest expense on corporate debt 0.3 0.9 1.2 2.7
Compensation and other 320.0 319.3 983.8 967.4
Operating expenses 387.9 384.9 1,172.8 1,163.7
Total segment expenses 448.0 466.9 1,405.6 1,423.9
Operating Segments | Benefits and Protection        
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]        
Benefits, claims and settlement expenses 705.0 679.7 2,123.4 1,990.0
Liability for future policy benefit remeasurement (gain) loss 72.8 97.1 68.7 151.7
Dividends to policyholders 29.9 14.9 71.9 68.0
Commission expense 132.4 131.7 419.1 405.4
Capitalization of deferred acquisition costs and contract costs (74.3) (75.7) (236.0) (239.9)
Amortization of deferred acquisition costs and contract costs 63.9 63.7 192.3 189.1
Depreciation and amortization 4.3 4.9 13.0 16.0
Compensation and other 240.0 232.8 715.0 697.8
Operating expenses 366.3 357.4 1,103.4 1,068.4
Total segment expenses 1,174.0 1,149.1 3,367.4 3,278.1
Operating Segments | Corporate        
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]        
Benefits, claims and settlement expenses (1.1) (1.4) 21.7 6.8
Commission expense 26.9 19.6 75.6 56.9
Depreciation and amortization 3.8 4.6 12.1 13.6
Interest expense on corporate debt 45.0 41.7 132.4 125.1
Compensation and other 43.5 37.3 125.0 131.7
Operating expenses 119.2 103.2 345.1 327.3
Total segment expenses 118.1 101.8 366.8 334.1
Reconciling items        
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]        
Net realized capital gains (losses) expense adjustments 80.0 90.8 145.2 198.2
Market risk benefit derivative settlements (10.1) (11.6) (32.2) (34.3)
Expenses from exited business 47.4 68.1 222.7 361.5
Total expenses $ 3,433.2 $ 3,305.4 $ 10,268.4 $ 10,598.5