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Investments - Gross Unrealized Losses for Fixed Maturities (Details)
$ in Millions
Mar. 31, 2021
USD ($)
item
$ / shares
Dec. 31, 2020
USD ($)
item
Gross Unrealized Losses for Fixed Maturities    
Fixed maturities, Less than twelve months, Fair value $ 12,123.5 $ 5,909.4
Fixed maturities, Less than twelve months, Gross unrealized losses 452.4 138.8
Fixed maturities, Greater than or equal to twelve months, Fair value 2,546.3 1,399.1
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses 110.9 67.4
Fixed maturities, Total, Fair value 14,669.8 7,308.5
Fixed maturities, Total, Gross unrealized losses 563.3 206.2
U.S. government and agencies    
Gross Unrealized Losses for Fixed Maturities    
Fixed maturities, Less than twelve months, Fair value 528.1 351.1
Fixed maturities, Less than twelve months, Gross unrealized losses 60.0 10.4
Fixed maturities, Total, Fair value 528.1 351.1
Fixed maturities, Total, Gross unrealized losses 60.0 10.4
Non-U.S. governments    
Gross Unrealized Losses for Fixed Maturities    
Fixed maturities, Less than twelve months, Fair value 33.7  
Fixed maturities, Less than twelve months, Gross unrealized losses 0.9  
Fixed maturities, Total, Fair value 33.7  
Fixed maturities, Total, Gross unrealized losses 0.9  
States and political subdivisions    
Gross Unrealized Losses for Fixed Maturities    
Fixed maturities, Less than twelve months, Fair value 1,648.1 363.5
Fixed maturities, Less than twelve months, Gross unrealized losses 72.0 12.5
Fixed maturities, Greater than or equal to twelve months, Fair value 56.6  
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses 7.3  
Fixed maturities, Total, Fair value 1,704.7 363.5
Fixed maturities, Total, Gross unrealized losses 79.3 12.5
Corporate debt securities    
Gross Unrealized Losses for Fixed Maturities    
Fixed maturities, Less than twelve months, Fair value 5,874.6 1,578.7
Fixed maturities, Less than twelve months, Gross unrealized losses 264.0 54.4
Fixed maturities, Greater than or equal to twelve months, Fair value 606.7 267.9
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses 56.8 40.6
Fixed maturities, Total, Fair value 6,481.3 1,846.6
Fixed maturities, Total, Gross unrealized losses 320.8 95.0
Residential mortgage-backed pass-through securities    
Gross Unrealized Losses for Fixed Maturities    
Fixed maturities, Less than twelve months, Fair value 874.6 92.3
Fixed maturities, Less than twelve months, Gross unrealized losses 18.6 0.2
Fixed maturities, Greater than or equal to twelve months, Fair value 1.3 1.6
Fixed maturities, Total, Fair value 875.9 93.9
Fixed maturities, Total, Gross unrealized losses 18.6 0.2
Commercial mortgage-backed securities    
Gross Unrealized Losses for Fixed Maturities    
Fixed maturities, Less than twelve months, Fair value 898.2 970.9
Fixed maturities, Less than twelve months, Gross unrealized losses 18.6 22.1
Fixed maturities, Greater than or equal to twelve months, Fair value 628.1 137.4
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses 30.4 12.2
Fixed maturities, Total, Fair value 1,526.3 1,108.3
Fixed maturities, Total, Gross unrealized losses 49.0 34.3
Collateralized debt obligations    
Gross Unrealized Losses for Fixed Maturities    
Fixed maturities, Less than twelve months, Fair value 820.0 1,750.6
Fixed maturities, Less than twelve months, Gross unrealized losses 2.4 11.1
Fixed maturities, Greater than or equal to twelve months, Fair value 1,060.6 931.1
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses 9.9 12.9
Fixed maturities, Total, Fair value 1,880.6 2,681.7
Fixed maturities, Total, Gross unrealized losses 12.3 24.0
Other debt obligations    
Gross Unrealized Losses for Fixed Maturities    
Fixed maturities, Less than twelve months, Fair value 1,446.2 802.3
Fixed maturities, Less than twelve months, Gross unrealized losses 15.9 28.1
Fixed maturities, Greater than or equal to twelve months, Fair value 193.0 61.1
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses 6.5 1.7
Fixed maturities, Total, Fair value 1,639.2 863.4
Fixed maturities, Total, Gross unrealized losses 22.4 29.8
Principal Life Insurance Company    
Gross Unrealized Losses for Fixed Maturities    
Fixed maturities, Less than twelve months, Fair value 11,086.7 5,638.3
Fixed maturities, Less than twelve months, Gross unrealized losses 418.4 122.4
Fixed maturities, Greater than or equal to twelve months, Fair value 2,526.9 1,391.3
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses 86.8 51.5
Fixed maturities, Total, Fair value 13,613.6 7,029.6
Fixed maturities, Total, Gross unrealized losses $ 505.2 $ 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) 90.00% 89.00%
Available-for-sale Securities in Unrealized Loss Positions, Qualitative Disclosure, Average Price (percent of carrying value to amortized cost) 96 98
Available-for-sale Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less Than Twelve Months | item 1,807 619
Available-for-sale Securities in Unrealized Loss Positions, Average Price, Less Than Twelve Months (percent of carrying value to amortized cost) 96 98
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 $ 384.7 $ 98.4
Available-for-sale Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Twelve Months or Longer | item 372 198
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 $ 33.6 $ 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 95 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 $ 30.0  
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 95 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 $ 9.9 $ 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 99 99