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Schedule III - Supplementary Insurance Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Supplementary Insurance Information        
Deferred acquisition costs $ 3,950.5 $ 3,948.0   $ 3,822.3
Market risk benefit asset 153.4 109.2    
Future policy benefits and claims 46,826.5 43,314.0    
Contractholder and other policyholder funds 42,417.9 43,736.8    
Market risk benefit liability 133.2 207.4    
Premiums and other considerations 6,470.9 5,339.7 $ 4,841.5  
Net investment income 4,091.9 3,838.5 4,429.6  
Benefits, claims and settlement expenses 7,788.2 6,631.3 7,258.2  
Liability for future policy benefit remeasurement (gain) loss (51.6) (264.5) (4.4)  
Market risk benefit remeasurement (gain) loss 29.1 125.3 98.3  
Amortization of deferred acquisition costs 389.8 386.9 373.4  
Other operating expenses 4,682.3 4,575.3 4,696.6  
Retirement and Income Solutions        
Supplementary Insurance Information        
Deferred acquisition costs 918.9 930.0   964.4
Market risk benefit asset 153.4 109.2    
Future policy benefits and claims 29,161.9 26,651.8    
Contractholder and other policyholder funds 34,399.6 35,338.0    
Market risk benefit liability 111.9 181.4    
Premiums and other considerations 2,935.0 1,959.7 1,883.6  
Net investment income 2,674.3 2,252.2 2,674.4  
Benefits, claims and settlement expenses 4,653.5 3,328.1 3,547.3  
Liability for future policy benefit remeasurement (gain) loss (68.5) (14.9) (3.8)  
Market risk benefit remeasurement (gain) loss 33.7 131.2 114.1  
Amortization of deferred acquisition costs 95.8 101.0 107.1  
Other operating expenses 1,590.7 1,601.4 1,712.6  
Principal Asset Management        
Supplementary Insurance Information        
Deferred acquisition costs 7.7 8.8    
Future policy benefits and claims 4,595.6 5,043.8    
Contractholder and other policyholder funds 507.8 915.2    
Market risk benefit liability 21.3 26.0    
Premiums and other considerations 29.0 77.7 127.5  
Net investment income 628.6 840.6 659.1  
Benefits, claims and settlement expenses 477.6 725.9 636.4  
Liability for future policy benefit remeasurement (gain) loss 0.9 (4.7) (4.9)  
Market risk benefit remeasurement (gain) loss (4.6) (5.9) (15.8)  
Amortization of deferred acquisition costs 1.1 1.1 1.2  
Other operating expenses 1,544.2 1,502.1 1,570.7  
Benefits and Protection        
Supplementary Insurance Information        
Deferred acquisition costs 3,023.9 3,009.2   $ 2,857.9
Future policy benefits and claims 12,888.3 11,411.6    
Contractholder and other policyholder funds 7,870.8 7,844.2    
Premiums and other considerations 3,521.4 3,306.5 2,830.4  
Net investment income 549.5 564.2 917.1  
Benefits, claims and settlement expenses 2,647.7 2,553.7 3,069.3  
Liability for future policy benefit remeasurement (gain) loss 16.0 (244.9) 4.3  
Amortization of deferred acquisition costs 292.9 284.8 265.1  
Other operating expenses 1,088.0 1,027.5 996.4  
Corporate        
Supplementary Insurance Information        
Future policy benefits and claims 180.7 206.8    
Contractholder and other policyholder funds (360.3) (360.6)    
Premiums and other considerations (14.5) (4.2)    
Net investment income 239.5 181.5 179.0  
Benefits, claims and settlement expenses 9.4 23.6 5.2  
Other operating expenses $ 459.4 $ 444.3 $ 416.9