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Separate Account Balances - Principal Asset Management - International Pension (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Changes in separate account liabilities    
Balance at beginning of period $ 167,605.6  
Balance at end of period 173,327.1 $ 167,605.6
Principal Asset Management | International Pension    
Changes in separate account liabilities    
Balance at beginning of period 34,724.8  
Balance at end of period 32,802.2 34,724.8
Principal Asset Management | International Pension | Pension | Latin America    
Changes in separate account liabilities    
Balance at beginning of period 34,580.6 33,316.7
Premiums and deposits 3,347.7 3,628.6
Policy charges (16.6) (17.8)
Surrenders, withdrawals and benefit payments (3,638.0) (4,191.7)
Investment performance 2,890.1 2,733.7
Other 22.8 7.6
Foreign currency translation adjustment (4,384.4) (896.5)
Balance at end of period 32,802.2 34,580.6
Cash surrender value 32,802.2 34,580.6
Principal Asset Management | International Pension | Guaranteed pension | Asia    
Changes in separate account liabilities    
Balance at beginning of period 144.2 915.0
Premiums and deposits 31.9 217.2
Policy charges (1.2) (16.9)
Surrenders, withdrawals and benefit payments (142.8) (1,006.8)
Investment performance 3.3 37.7
Other (35.3) (0.3)
Foreign currency translation adjustment $ (0.1) (1.7)
Balance at end of period   144.2
Cash surrender value   $ 144.2