v3.26.3
Future Policy Benefits and Claims - Principal Asset Management - International Pension (Details) - Principal Asset Management - International Pension - Latin America - Individual fixed income annuities - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2026
Dec. 31, 2025
Present value of expected future policy benefit payments    
Balance at beginning of period, Present value of expected future policy benefit payments $ 4,600.5 $ 4,126.9
Effect of changes in discount rate assumptions at beginning of period (493.5) (368.4)
Balance at beginning of period at original discount rate 4,107.0 3,758.5
Effect of actual variances from expected experience 0.7 (0.4)
Adjusted beginning of period balance at original discount rate 4,107.7 3,758.1
Interest accrual 228.7 293.1
Benefit payments (241.0) (335.6)
Derecognition (3,954.5)  
Issuances   6.4
Foreign currency translation adjustment $ (140.9) 385.0
Balance at end of period at original discount rate   4,107.0
Effect of changes in discount rate assumptions at end of period   493.5
Balance at end of period, Present value of expected future policy benefit payments   $ 4,600.5
Weighted-average duration for future policy benefits (in years) 0 years 9 years 7 months 6 days