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Future Policy Benefits and Claims - Disaggregated Amounts Included in Future Policy Benefits and Claims (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Future Policy Benefits and Claims        
Liability for future policy benefits $ 32,949.4 $ 34,064.4   $ 43,489.8
Additional liability for certain benefit features 5,176.7 4,095.2    
Participating contracts 3,089.8 3,207.2    
Short-duration contracts 1,272.5 1,295.6    
Cost of reinsurance liability 150.2 191.1    
Reinsurance recoverable liability 40.6 39.4    
Other 6.7 132.4    
Future policy benefits and claims per consolidated statements of financial position 42,685.9 43,025.3    
Retirement and Income Solutions        
Future Policy Benefits and Claims        
Liability for future policy benefits 26,017.1 26,230.8   33,009.5
Retirement and Income Solutions | Pension risk transfer        
Future Policy Benefits and Claims        
Liability for future policy benefits 21,355.2 21,211.4   25,863.7
Retirement and Income Solutions | Individual fixed income annuities        
Future Policy Benefits and Claims        
Liability for future policy benefits 4,661.9 5,019.4   7,145.8
Principal Asset Management | Principal International | Latin America | Individual fixed income annuities        
Future Policy Benefits and Claims        
Liability for future policy benefits 4,225.1 5,042.3   6,561.5
Benefits and Protection        
Future Policy Benefits and Claims        
Liability for future policy benefits 2,554.2 2,607.8   3,661.2
Benefits and Protection | Specialty Benefits | Individual disability        
Future Policy Benefits and Claims        
Liability for future policy benefits 1,604.5 1,698.8 $ 2,498.4 2,500.9
Benefits and Protection | Life Insurance | Term life        
Future Policy Benefits and Claims        
Liability for future policy benefits 949.7 909.0 1,117.6 1,160.3
Benefits and Protection | Life Insurance | Universal life        
Future Policy Benefits and Claims        
Additional liability for certain benefit features 5,176.7 4,095.2 3,814.2  
Corporate | Long-term care insurance        
Future Policy Benefits and Claims        
Liability for future policy benefits $ 153.0 $ 183.5 $ 234.7 $ 257.6