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Investments - Gross Unrealized Losses for Fixed Maturities (Details)
$ in Millions
Dec. 31, 2021
USD ($)
item
Dec. 31, 2020
USD ($)
item
Gross Unrealized Losses for Fixed Maturities    
Fixed maturities, Less than twelve months, Fair value $ 14,561.3 $ 5,909.4
Fixed maturities, Less than twelve months, Gross unrealized losses 227.1 138.8
Fixed maturities, Greater than or equal to twelve months, Fair value 3,042.6 1,399.1
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses 179.3 67.4
Fixed maturities, Total, Fair value 17,603.9 7,308.5
Fixed maturities, Total, Gross unrealized losses 406.4 206.2
U.S. government and agencies    
Gross Unrealized Losses for Fixed Maturities    
Fixed maturities, Less than twelve months, Fair value 129.3 351.1
Fixed maturities, Less than twelve months, Gross unrealized losses 3.4 10.4
Fixed maturities, Greater than or equal to twelve months, Fair value 482.9  
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses 34.0  
Fixed maturities, Total, Fair value 612.2 351.1
Fixed maturities, Total, Gross unrealized losses 37.4 10.4
Non-U.S. governments    
Gross Unrealized Losses for Fixed Maturities    
Fixed maturities, Less than twelve months, Fair value 57.8  
Fixed maturities, Less than twelve months, Gross unrealized losses 2.0  
Fixed maturities, Total, Fair value 57.8  
Fixed maturities, Total, Gross unrealized losses 2.0  
States and political subdivisions    
Gross Unrealized Losses for Fixed Maturities    
Fixed maturities, Less than twelve months, Fair value 690.2 363.5
Fixed maturities, Less than twelve months, Gross unrealized losses 10.5 12.5
Fixed maturities, Greater than or equal to twelve months, Fair value 102.3  
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses 6.1  
Fixed maturities, Total, Fair value 792.5 363.5
Fixed maturities, Total, Gross unrealized losses 16.6 12.5
Corporate debt securities    
Gross Unrealized Losses for Fixed Maturities    
Fixed maturities, Less than twelve months, Fair value 5,281.6 1,578.7
Fixed maturities, Less than twelve months, Gross unrealized losses 121.2 54.4
Fixed maturities, Greater than or equal to twelve months, Fair value 1,327.5 267.9
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses 101.5 40.6
Fixed maturities, Total, Fair value 6,609.1 1,846.6
Fixed maturities, Total, Gross unrealized losses 222.7 95.0
Residential mortgage-backed pass-through securities    
Gross Unrealized Losses for Fixed Maturities    
Fixed maturities, Less than twelve months, Fair value 1,562.6 92.3
Fixed maturities, Less than twelve months, Gross unrealized losses 22.2 0.2
Fixed maturities, Greater than or equal to twelve months, Fair value 194.9 1.6
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses 6.3  
Fixed maturities, Total, Fair value 1,757.5 93.9
Fixed maturities, Total, Gross unrealized losses 28.5 0.2
Commercial mortgage-backed securities    
Gross Unrealized Losses for Fixed Maturities    
Fixed maturities, Less than twelve months, Fair value 1,297.4 970.9
Fixed maturities, Less than twelve months, Gross unrealized losses 15.6 22.1
Fixed maturities, Greater than or equal to twelve months, Fair value 299.6 137.4
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses 15.7 12.2
Fixed maturities, Total, Fair value 1,597.0 1,108.3
Fixed maturities, Total, Gross unrealized losses 31.3 34.3
Collateralized debt obligations    
Gross Unrealized Losses for Fixed Maturities    
Fixed maturities, Less than twelve months, Fair value 1,592.5 1,750.6
Fixed maturities, Less than twelve months, Gross unrealized losses 2.8 11.1
Fixed maturities, Greater than or equal to twelve months, Fair value 424.4 931.1
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses 6.7 12.9
Fixed maturities, Total, Fair value 2,016.9 2,681.7
Fixed maturities, Total, Gross unrealized losses 9.5 24.0
Other debt obligations    
Gross Unrealized Losses for Fixed Maturities    
Fixed maturities, Less than twelve months, Fair value 3,949.9 802.3
Fixed maturities, Less than twelve months, Gross unrealized losses 49.4 28.1
Fixed maturities, Greater than or equal to twelve months, Fair value 211.0 61.1
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses 9.0 1.7
Fixed maturities, Total, Fair value 4,160.9 863.4
Fixed maturities, Total, Gross unrealized losses 58.4 29.8
Principal Life Insurance Company    
Gross Unrealized Losses for Fixed Maturities    
Fixed maturities, Less than twelve months, Fair value 13,052.3 5,638.3
Fixed maturities, Less than twelve months, Gross unrealized losses 150.9 122.4
Fixed maturities, Greater than or equal to twelve months, Fair value 2,740.3 1,391.3
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses 137.1 51.5
Fixed maturities, Total, Fair value 15,792.6 7,029.6
Fixed maturities, Total, Gross unrealized losses $ 288.0 $ 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) 91.00% 89.00%
Available-for-sale Securities in Unrealized Loss Positions, Qualitative Disclosure, Average Price (percent of carrying value to amortized cost) 98.00% 98.00%
Available-for-sale Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less Than Twelve Months | item 1,805 619
Available-for-sale Securities in Unrealized Loss Positions, Average Price, Less Than Twelve Months (percent of carrying value to amortized cost) 99.00% 98.00%
Available-for-sale Securities in Unrealized Loss Positions, Percent Investment Grade, Less Than Twelve Months (as a percent) 90.00% 89.00%
Available-for-sale Securities in Unrealized Loss Position, Aggregate Losses On Investment Grade Investments, Less Than Twelve Months $ 138.9 $ 98.4
Available-for-sale Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Twelve Months or Longer | item 459 198
Available-for-sale Securities in Unrealized Loss Positions, Average Price, Twelve Months or Longer (percent of carrying value to amortized cost) 95.00% 96.00%
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 $ 67.1 $ 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) 95.00% 92.00%
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 $ 15.3 $ 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) 95.00% 92.00%
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 $ 6.7 $ 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) 98.00% 99.00%