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Contractholder Funds - GICs and Funding Agreements (Details) - Principal Life Insurance Company
$ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
item
Nov. 30, 2023
USD ($)
Dec. 31, 2022
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                  
Number of separate funding agreement programs | item 5                
FHLB Des Moines funding agreement program                  
Funding agreement disclosures                  
Funding agreements $ 3,981.8   $ 4,275.5            
1998 Funding agreement program                  
Funding agreement disclosures                  
Maximum authorized amount of funding agreements to be issued                 $ 4,000.0
Funding agreements 75.9   75.6            
2001 Funding agreement program                  
Funding agreement disclosures                  
Maximum authorized amount of funding agreements to be issued               $ 7,000.0  
Funding agreements 201.9   201.9            
2011 Funding agreement program                  
Funding agreement disclosures                  
Maximum authorized amount of funding agreements to be issued             $ 5,000.0    
Funding agreements $ 8,072.6   $ 7,765.7            
Additional maximum authorized amount of funding agreements to be issued   $ 4,000.0   $ 4,000.0 $ 4,000.0 $ 4,000.0