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Separate Account Balances - Principal Asset Management - Principal International (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Changes in separate account liabilities    
Balance at beginning of period $ 167,605.6  
Balance at end of period 171,399.8 $ 167,605.6
Principal Asset Management | Principal International    
Changes in separate account liabilities    
Balance at beginning of period 34,724.8  
Balance at end of period 32,849.7 34,724.8
Principal Asset Management | Principal International | Pension | Latin America    
Changes in separate account liabilities    
Balance at beginning of period 34,580.6 33,316.7
Premiums and deposits 1,657.8 3,628.6
Policy charges (8.2) (17.8)
Surrenders, withdrawals and benefit payments (1,802.3) (4,191.7)
Investment performance 994.6 2,733.7
Other 7.6 7.6
Foreign currency translation adjustment (2,580.4) (896.5)
Balance at end of period 32,849.7 34,580.6
Cash surrender value 32,849.7 34,580.6
Principal Asset Management | Principal International | 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