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Schedule III - Supplementary Insurance Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Supplementary Insurance Information        
Deferred acquisition costs $ 3,757.5 $ 3,409.7 $ 3,521.3 $ 3,693.5
Future policy benefits and claims 43,948.1 45,207.2    
Contractholder and other policyholder funds 44,669.0 44,297.1    
Premiums and other considerations 4,841.5 6,037.4 7,866.6  
Net investment income (loss) 4,406.1 3,890.6 3,998.4  
Benefits, claims and settlement expenses 7,097.0 8,281.5 9,905.8  
Amortization of deferred acquisition costs 285.4 388.1 347.0  
Other operating expenses 4,701.9 4,258.4 4,156.9  
Retirement and Income Solutions        
Supplementary Insurance Information        
Deferred acquisition costs 819.4 730.4    
Future policy benefits and claims 27,716.5 28,134.1    
Contractholder and other policyholder funds 35,941.4 35,576.0    
Premiums and other considerations 1,883.6 3,221.0 4,862.7  
Net investment income (loss) 2,674.4 2,457.9 2,420.4  
Benefits, claims and settlement expenses 3,450.1 4,899.4 6,527.8  
Amortization of deferred acquisition costs 116.7 82.2 87.8  
Other operating expenses 1,715.2 1,578.2 1,403.5  
Principal Global Investors        
Supplementary Insurance Information        
Net investment income (loss) 3.9 5.6 10.1  
Other operating expenses 1,128.6 1,029.6 1,028.5  
Principal International        
Supplementary Insurance Information        
Deferred acquisition costs 8.4 11.2    
Future policy benefits and claims 3,813.5 5,109.5    
Contractholder and other policyholder funds 1,047.2 1,167.3    
Premiums and other considerations 127.5 156.6 393.3  
Net investment income (loss) 631.1 446.8 575.9  
Benefits, claims and settlement expenses 610.0 440.7 728.3  
Amortization of deferred acquisition costs 1.2 1.2 1.3  
Other operating expenses 469.1 416.8 436.0  
U.S. Insurance Solutions        
Supplementary Insurance Information        
Deferred acquisition costs 2,929.7 2,668.1    
Future policy benefits and claims 12,262.1 11,800.3    
Contractholder and other policyholder funds 8,039.6 7,909.5    
Premiums and other considerations 2,830.4 2,659.8 2,610.6  
Net investment income (loss) 917.1 850.6 854.5  
Benefits, claims and settlement expenses 3,031.7 2,937.2 2,639.2  
Amortization of deferred acquisition costs 167.5 304.7 257.9  
Other operating expenses 998.2 936.9 946.5  
Corporate        
Supplementary Insurance Information        
Future policy benefits and claims 156.0 163.3    
Contractholder and other policyholder funds (359.2) (355.7)    
Net investment income (loss) 179.6 129.7 137.5  
Benefits, claims and settlement expenses 5.2 4.2 10.5  
Other operating expenses $ 390.8 $ 296.9 $ 342.4