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Future Policy Benefits and Claims - Disaggregated Amounts Included in Future Policy Benefits and Claims (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Future Policy Benefits and Claims        
Liability for future policy benefits $ 35,620.8 $ 34,064.4   $ 43,489.8
Additional liability for certain benefit features 4,219.3 4,095.2    
Participating contracts 3,166.3 3,207.2    
Short-duration contracts 1,294.0 1,295.6    
Cost of reinsurance liability 184.5 191.1    
Reinsurance recoverable liability 43.5 39.4    
Other 171.5 132.4    
Future policy benefits and claims per consolidated statements of financial position 44,699.9 43,025.3    
Retirement and Income Solutions        
Future Policy Benefits and Claims        
Liability for future policy benefits 27,238.4 26,230.8   33,009.5
Retirement and Income Solutions | Pension risk transfer        
Future Policy Benefits and Claims        
Liability for future policy benefits 22,146.1 21,211.4   25,863.7
Retirement and Income Solutions | Individual fixed income annuities        
Future Policy Benefits and Claims        
Liability for future policy benefits 5,092.3 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 5,416.9 5,042.3   6,561.5
Benefits and Protection        
Future Policy Benefits and Claims        
Liability for future policy benefits 2,777.1 2,607.8   3,661.2
Benefits and Protection | Specialty Benefits | Individual disability        
Future Policy Benefits and Claims        
Liability for future policy benefits 1,815.9 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 961.2 909.0 1,117.6 1,160.3
Benefits and Protection | Life Insurance | Universal life        
Future Policy Benefits and Claims        
Additional liability for certain benefit features 4,219.3 4,095.2 3,814.2  
Corporate | Long-term care insurance        
Future Policy Benefits and Claims        
Liability for future policy benefits $ 188.4 $ 183.5 $ 234.7 $ 257.6