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Insurance Liabilities - Contractholder Funding Agreements (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2022
USD ($)
item
Dec. 31, 2021
USD ($)
Feb. 28, 2021
USD ($)
Nov. 30, 2017
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2001
USD ($)
Dec. 31, 1998
USD ($)
Funding agreement disclosures                
Funding agreements $ 12,318.7 $ 11,685.5            
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 $ 4,275.5 4,252.4            
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 75.6 75.0            
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 201.9 201.8            
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 $ 7,765.7 $ 7,156.3            
Additional maximum authorized amount of funding agreements to be issued     $ 4,000.0 $ 4,000.0 $ 4,000.0