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Investments - Gross Unrealized Losses for Fixed Maturities (Details) $ in Millions | Sep. 30, 2023 USD ($) item | Dec. 31, 2022 USD ($) item
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Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | $ 13,826.5 | $ 45,651.0
Fixed maturities, Less than twelve months, Gross unrealized losses | 818.9 | 6,183.1
Fixed maturities, Greater than or equal to twelve months, Fair value | 40,232.1 | 8,850.9
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | 8,415.0 | 1,695.2
Fixed maturities, Total, Fair value | 54,058.6 | 54,501.9
Fixed maturities, Total, Gross unrealized losses | 9,233.9 | 7,878.3
U.S. government and agencies |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | 391.1 | 1,528.3
Fixed maturities, Less than twelve months, Gross unrealized losses | 11.5 | 209.4
Fixed maturities, Greater than or equal to twelve months, Fair value | 1,052.8 | 181.5
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | 302.0 | 41.8
Fixed maturities, Total, Fair value | 1,443.9 | 1,709.8
Fixed maturities, Total, Gross unrealized losses | 313.5 | 251.2
Non-U.S. governments |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | 55.2 | 407.5
Fixed maturities, Less than twelve months, Gross unrealized losses | 6.6 | 57.7
Fixed maturities, Greater than or equal to twelve months, Fair value | 307.9 | 19.9
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | 80.8 | 7.1
Fixed maturities, Total, Fair value | 363.1 | 427.4
Fixed maturities, Total, Gross unrealized losses | 87.4 | 64.8
States and political subdivisions |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | 1,258.4 | 5,303.5
Fixed maturities, Less than twelve months, Gross unrealized losses | 106.6 | 1,008.9
Fixed maturities, Greater than or equal to twelve months, Fair value | 4,756.6 | 391.9
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | 1,348.9 | 127.8
Fixed maturities, Total, Fair value | 6,015.0 | 5,695.4
Fixed maturities, Total, Gross unrealized losses | 1,455.5 | 1,136.7
Corporate debt securities |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | 7,731.5 | 27,309.5
Fixed maturities, Less than twelve months, Gross unrealized losses | 548.3 | 3,944.6
Fixed maturities, Greater than or equal to twelve months, Fair value | 21,781.1 | 2,944.1
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | 4,872.0 | 698.0
Fixed maturities, Total, Fair value | 29,512.6 | 30,253.6
Fixed maturities, Total, Gross unrealized losses | 5,420.3 | 4,642.6
Residential mortgage-backed pass-through securities |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | 1,427.7 | 1,201.7
Fixed maturities, Less than twelve months, Gross unrealized losses | 63.7 | 97.5
Fixed maturities, Greater than or equal to twelve months, Fair value | 1,236.4 | 574.8
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | 231.4 | 105.7
Fixed maturities, Total, Fair value | 2,664.1 | 1,776.5
Fixed maturities, Total, Gross unrealized losses | 295.1 | 203.2
Commercial mortgage-backed securities |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | 438.7 | 3,648.5
Fixed maturities, Less than twelve months, Gross unrealized losses | 13.9 | 484.0
Fixed maturities, Greater than or equal to twelve months, Fair value | 4,156.5 | 1,124.8
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | 762.7 | 222.5
Fixed maturities, Total, Fair value | 4,595.2 | 4,773.3
Fixed maturities, Total, Gross unrealized losses | 776.6 | 706.5
Collateralized debt obligations |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | 258.4 | 2,832.2
Fixed maturities, Less than twelve months, Gross unrealized losses | 2.6 | 89.0
Fixed maturities, Greater than or equal to twelve months, Fair value | 2,530.2 | 1,330.1
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | 41.5 | 54.7
Fixed maturities, Total, Fair value | 2,788.6 | 4,162.3
Fixed maturities, Total, Gross unrealized losses | 44.1 | 143.7
Other debt obligations |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | 2,265.5 | 3,419.8
Fixed maturities, Less than twelve months, Gross unrealized losses | 65.7 | 292.0
Fixed maturities, Greater than or equal to twelve months, Fair value | 4,410.6 | 2,283.8
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | 775.7 | 437.6
Fixed maturities, Total, Fair value | 6,676.1 | 5,703.6
Fixed maturities, Total, Gross unrealized losses | 841.4 | 729.6
Principal Life Insurance Company |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | 12,608.0 | 44,857.0
Fixed maturities, Less than twelve months, Gross unrealized losses | 737.2 | 6,096.3
Fixed maturities, Greater than or equal to twelve months, Fair value | 39,508.4 | 8,496.1
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | 8,251.3 | 1,645.1
Fixed maturities, Total, Fair value | 52,116.4 | 53,353.1
Fixed maturities, Total, Gross unrealized losses | $ 8,988.5 | $ 7,741.4
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) | 95.00% | 94.00%
Available-for-sale Securities in Unrealized Loss Positions, Qualitative Disclosure, Average Price (percent of carrying value to amortized cost) | 85.00% | 87.00%
Available-for-sale Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less Than Twelve Months | item | 2,321 | 7,589
Available-for-sale Securities in Unrealized Loss Positions, Average Price, Less Than Twelve Months (percent of carrying value to amortized cost) | 94.00% | 88.00%
Available-for-sale Securities in Unrealized Loss Positions, Percent Investment Grade, Less Than Twelve Months (as a percent) | 90.00% | 95.00%
Available-for-sale Securities in Unrealized Loss Position, Aggregate Losses On Investment Grade Investments, Less Than Twelve Months | $ 712.2 | $ 5,920.4
Available-for-sale Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Twelve Months or Longer | item | 7,223 | 1,654
Available-for-sale Securities in Unrealized Loss Positions, Average Price, Twelve Months or Longer (percent of carrying value to amortized cost) | 83.00% | 84.00%
Principal Life Insurance Company | States and political subdivisions |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | $ 1,337.1 | $ 126.8
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) | 78.00% | 75.00%
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 | $ 4,735.6 | $ 654.9
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) | 82.00% | 80.00%
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 | $ 757.4 | $ 220.9
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) | 84.00% | 83.00%
Principal Life Insurance Company | Collateralized mortgage obligation security |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | $ 612.3 | $ 320.2
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) | 80.00% | 81.00%

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