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Investments - Gross Unrealized Losses for Fixed Maturities (Details)
$ in Millions
Jun. 30, 2021
USD ($)
item
$ / shares
Dec. 31, 2020
USD ($)
item
Gross Unrealized Losses for Fixed Maturities    
Fixed maturities, Less than twelve months, Fair value $ 8,214.1 $ 5,909.4
Fixed maturities, Less than twelve months, Gross unrealized losses 190.9 138.8
Fixed maturities, Greater than or equal to twelve months, Fair value 1,847.2 1,399.1
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses 83.4 67.4
Fixed maturities, Total, Fair value 10,061.3 7,308.5
Fixed maturities, Total, Gross unrealized losses 274.3 206.2
U.S. government and agencies    
Gross Unrealized Losses for Fixed Maturities    
Fixed maturities, Less than twelve months, Fair value 537.2 351.1
Fixed maturities, Less than twelve months, Gross unrealized losses 40.3 10.4
Fixed maturities, Total, Fair value 537.2 351.1
Fixed maturities, Total, Gross unrealized losses 40.3 10.4
Non-U.S. governments    
Gross Unrealized Losses for Fixed Maturities    
Fixed maturities, Less than twelve months, Fair value 16.4  
Fixed maturities, Less than twelve months, Gross unrealized losses 0.1  
Fixed maturities, Total, Fair value 16.4  
Fixed maturities, Total, Gross unrealized losses 0.1  
States and political subdivisions    
Gross Unrealized Losses for Fixed Maturities    
Fixed maturities, Less than twelve months, Fair value 756.5 363.5
Fixed maturities, Less than twelve months, Gross unrealized losses 17.1 12.5
Fixed maturities, Greater than or equal to twelve months, Fair value 117.2  
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses 10.3  
Fixed maturities, Total, Fair value 873.7 363.5
Fixed maturities, Total, Gross unrealized losses 27.4 12.5
Corporate debt securities    
Gross Unrealized Losses for Fixed Maturities    
Fixed maturities, Less than twelve months, Fair value 3,082.8 1,578.7
Fixed maturities, Less than twelve months, Gross unrealized losses 100.2 54.4
Fixed maturities, Greater than or equal to twelve months, Fair value 583.7 267.9
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses 39.6 40.6
Fixed maturities, Total, Fair value 3,666.5 1,846.6
Fixed maturities, Total, Gross unrealized losses 139.8 95.0
Residential mortgage-backed pass-through securities    
Gross Unrealized Losses for Fixed Maturities    
Fixed maturities, Less than twelve months, Fair value 926.3 92.3
Fixed maturities, Less than twelve months, Gross unrealized losses 11.4 0.2
Fixed maturities, Greater than or equal to twelve months, Fair value 0.8 1.6
Fixed maturities, Total, Fair value 927.1 93.9
Fixed maturities, Total, Gross unrealized losses 11.4 0.2
Commercial mortgage-backed securities    
Gross Unrealized Losses for Fixed Maturities    
Fixed maturities, Less than twelve months, Fair value 402.5 970.9
Fixed maturities, Less than twelve months, Gross unrealized losses 5.7 22.1
Fixed maturities, Greater than or equal to twelve months, Fair value 436.1 137.4
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses 19.5 12.2
Fixed maturities, Total, Fair value 838.6 1,108.3
Fixed maturities, Total, Gross unrealized losses 25.2 34.3
Collateralized debt obligations    
Gross Unrealized Losses for Fixed Maturities    
Fixed maturities, Less than twelve months, Fair value 1,009.6 1,750.6
Fixed maturities, Less than twelve months, Gross unrealized losses 2.5 11.1
Fixed maturities, Greater than or equal to twelve months, Fair value 528.1 931.1
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses 8.2 12.9
Fixed maturities, Total, Fair value 1,537.7 2,681.7
Fixed maturities, Total, Gross unrealized losses 10.7 24.0
Other debt obligations    
Gross Unrealized Losses for Fixed Maturities    
Fixed maturities, Less than twelve months, Fair value 1,482.8 802.3
Fixed maturities, Less than twelve months, Gross unrealized losses 13.6 28.1
Fixed maturities, Greater than or equal to twelve months, Fair value 181.3 61.1
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses 5.8 1.7
Fixed maturities, Total, Fair value 1,664.1 863.4
Fixed maturities, Total, Gross unrealized losses 19.4 29.8
Principal Life Insurance Company    
Gross Unrealized Losses for Fixed Maturities    
Fixed maturities, Less than twelve months, Fair value 6,884.9 5,638.3
Fixed maturities, Less than twelve months, Gross unrealized losses 147.9 122.4
Fixed maturities, Greater than or equal to twelve months, Fair value 1,761.5 1,391.3
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses 63.3 51.5
Fixed maturities, Total, Fair value 8,646.4 7,029.6
Fixed maturities, Total, Gross unrealized losses $ 211.2 $ 173.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure    
Available-for-sale Securities in Unrealized Loss Positions, Qualitative Disclosure, Percent Investment Grade (as a percent) 88.00% 89.00%
Available-for-sale Securities in Unrealized Loss Positions, Qualitative Disclosure, Average Price (percent of carrying value to amortized cost) 98 98
Available-for-sale Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less Than Twelve Months | item 908 619
Available-for-sale Securities in Unrealized Loss Positions, Average Price, Less Than Twelve Months (percent of carrying value to amortized cost) 98 98
Available-for-sale Securities in Unrealized Loss Positions, Percent Investment Grade, Less Than Twelve Months (as a percent) 89.00% 89.00%
Available-for-sale Securities in Unrealized Loss Position, Aggregate Losses On Investment Grade Investments, Less Than Twelve Months $ 135.6 $ 98.4
Available-for-sale Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Twelve Months or Longer | item 292 198
Available-for-sale Securities in Unrealized Loss Positions, Average Price, Twelve Months or Longer (percent of carrying value to amortized cost) | item 97 96
Principal Life Insurance Company | Corporate debt securities    
Gross Unrealized Losses for Fixed Maturities    
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses $ 20.0 $ 24.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure    
Available-for-sale Securities in Unrealized Loss Positions, Average Price, Twelve Months or Longer (percent of carrying value to amortized cost) | item 96 92
Principal Life Insurance Company | Commercial mortgage-backed securities    
Gross Unrealized Losses for Fixed Maturities    
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses $ 19.2  
Fixed maturities, Total, Gross unrealized losses   $ 11.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure    
Available-for-sale Securities in Unrealized Loss Positions, Average Price, Twelve Months or Longer (percent of carrying value to amortized cost) | item 96 92
Principal Life Insurance Company | Collateralized debt obligations    
Gross Unrealized Losses for Fixed Maturities    
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses $ 8.2 $ 12.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure    
Available-for-sale Securities in Unrealized Loss Positions, Average Price, Twelve Months or Longer (percent of carrying value to amortized cost) | item 98 99