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Insurance Liabilities - Contractholder Funding Agreements (Details)
$ in Millions, € in Billions
 12 Months Ended
Dec. 31, 2021
USD ($)
item
Feb. 28, 2021
USD ($)
Dec. 31, 2020
USD ($)
Nov. 30, 2017
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2006
USD ($)
Dec. 31, 2006
EUR (€)
Dec. 31, 2001
USD ($)
Dec. 31, 1998
USD ($)
Funding agreement disclosures                    
Funding agreements $ 11,685.5   $ 9,407.3              
Principal Life Insurance Company                    
Funding agreement disclosures                    
Number of separate funding agreement programs | item 5                  
Principal Life Insurance Company | FHLB Des Moines funding agreement program                    
Funding agreement disclosures                    
Funding agreements $ 4,252.4   4,252.5              
Principal Life Insurance Company | 1998 Funding agreement program                    
Funding agreement disclosures                    
Maximum authorized amount of funding agreements to be issued                   $ 4,000.0
Funding agreements 75.0   75.0              
Principal Life Insurance Company | 2006 Funding agreement program                    
Funding agreement disclosures                    
Maximum authorized amount of funding agreements to be issued             $ 5,300.0 € 4.0    
Funding agreements 0.0   122.4              
Principal Life Insurance Company | 2001 Funding agreement program                    
Funding agreement disclosures                    
Maximum authorized amount of funding agreements to be issued                 $ 7,000.0  
Funding agreements     201.8              
Principal Life Insurance Company | 2011 Funding agreement program                    
Funding agreement disclosures                    
Maximum authorized amount of funding agreements to be issued           $ 5,000.0        
Funding agreements $ 7,156.3   $ 4,755.8              
Additional maximum authorized amount of funding agreements to be issued   $ 4,000.0   $ 4,000.0 $ 4,000.0          
Amount of funding agreement authorization used at time additional amount authorized         $ 5,000.0