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Investments - Gross Unrealized Losses for Fixed Maturities (Details) $ in Millions | Dec. 31, 2023 USD ($) security | Dec. 31, 2022 USD ($) security
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Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | $ 6,667.6 | $ 45,651.0
Fixed maturities, Less than twelve months, Gross unrealized losses | 180.0 | 6,183.1
Fixed maturities, Greater than or equal to twelve months, Fair value | 41,511.0 | 8,850.9
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | 5,692.9 | 1,695.2
Fixed maturities, Total, Fair value | 48,178.6 | 54,501.9
Fixed maturities, Total, Gross unrealized losses | 5,872.9 | 7,878.3
U.S. government and agencies |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | 316.4 | 1,528.3
Fixed maturities, Less than twelve months, Gross unrealized losses | 3.1 | 209.4
Fixed maturities, Greater than or equal to twelve months, Fair value | 997.1 | 181.5
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | 232.6 | 41.8
Fixed maturities, Total, Fair value | 1,313.5 | 1,709.8
Fixed maturities, Total, Gross unrealized losses | 235.7 | 251.2
Non-U.S. governments |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | 41.9 | 407.5
Fixed maturities, Less than twelve months, Gross unrealized losses | 1.7 | 57.7
Fixed maturities, Greater than or equal to twelve months, Fair value | 331.3 | 19.9
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | 57.9 | 7.1
Fixed maturities, Total, Fair value | 373.2 | 427.4
Fixed maturities, Total, Gross unrealized losses | 59.6 | 64.8
States and political subdivisions |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | 596.6 | 5,303.5
Fixed maturities, Less than twelve months, Gross unrealized losses | 19.0 | 1,008.9
Fixed maturities, Greater than or equal to twelve months, Fair value | 5,075.1 | 391.9
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | 914.8 | 127.8
Fixed maturities, Total, Fair value | 5,671.7 | 5,695.4
Fixed maturities, Total, Gross unrealized losses | 933.8 | 1,136.7
Corporate debt securities |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | 3,210.1 | 27,309.5
Fixed maturities, Less than twelve months, Gross unrealized losses | 126.9 | 3,944.6
Fixed maturities, Greater than or equal to twelve months, Fair value | 22,929.1 | 2,944.1
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | 3,064.4 | 698.0
Fixed maturities, Total, Fair value | 26,139.2 | 30,253.6
Fixed maturities, Total, Gross unrealized losses | 3,191.3 | 4,642.6
Residential mortgage-backed pass-through securities |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | 633.0 | 1,201.7
Fixed maturities, Less than twelve months, Gross unrealized losses | 4.9 | 97.5
Fixed maturities, Greater than or equal to twelve months, Fair value | 1,275.6 | 574.8
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | 159.7 | 105.7
Fixed maturities, Total, Fair value | 1,908.6 | 1,776.5
Fixed maturities, Total, Gross unrealized losses | 164.6 | 203.2
Commercial mortgage-backed securities |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | 280.3 | 3,648.5
Fixed maturities, Less than twelve months, Gross unrealized losses | 4.1 | 484.0
Fixed maturities, Greater than or equal to twelve months, Fair value | 4,192.4 | 1,124.8
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | 650.1 | 222.5
Fixed maturities, Total, Fair value | 4,472.7 | 4,773.3
Fixed maturities, Total, Gross unrealized losses | 654.2 | 706.5
Collateralized debt obligations |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | 405.6 | 2,832.2
Fixed maturities, Less than twelve months, Gross unrealized losses | 1.8 | 89.0
Fixed maturities, Greater than or equal to twelve months, Fair value | 2,301.6 | 1,330.1
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | 25.4 | 54.7
Fixed maturities, Total, Fair value | 2,707.2 | 4,162.3
Fixed maturities, Total, Gross unrealized losses | 27.2 | 143.7
Other debt obligations |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | 1,183.7 | 3,419.8
Fixed maturities, Less than twelve months, Gross unrealized losses | 18.5 | 292.0
Fixed maturities, Greater than or equal to twelve months, Fair value | 4,408.8 | 2,283.8
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | 588.0 | 437.6
Fixed maturities, Total, Fair value | 5,592.5 | 5,703.6
Fixed maturities, Total, Gross unrealized losses | 606.5 | 729.6
Principal Life Insurance Company |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | 5,836.0 | 44,857.0
Fixed maturities, Less than twelve months, Gross unrealized losses | 140.5 | 6,096.3
Fixed maturities, Greater than or equal to twelve months, Fair value | 40,717.9 | 8,496.1
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | 5,576.6 | 1,645.1
Fixed maturities, Total, Fair value | 46,553.9 | 53,353.1
Fixed maturities, Total, Gross unrealized losses | $ 5,717.1 | $ 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) | 94.00% | 94.00%
Available-for-sale Securities in Unrealized Loss Positions, Qualitative Disclosure, Average Price (percent of carrying value to amortized cost) | 89.00% | 87.00%
Available-for-sale Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less Than Twelve Months | security | 983 | 7,589
Available-for-sale Securities in Unrealized Loss Positions, Average Price, Less Than Twelve Months (percent of carrying value to amortized cost) | 98.00% | 88.00%
Available-for-sale Securities in Unrealized Loss Positions, Percent Investment Grade, Less Than Twelve Months (as a percent) | 91.00% | 95.00%
Available-for-sale Securities in Unrealized Loss Position, Aggregate Losses On Investment Grade Investments, Less Than Twelve Months | $ 131.2 | $ 5,920.4
Available-for-sale Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Twelve Months or Longer | security | 7,042 | 1,654
Available-for-sale Securities in Unrealized Loss Positions, Average Price, Twelve Months or Longer (percent of carrying value to amortized cost) | 88.00% | 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 | $ 906.9 | $ 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) | 85.00% | 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 | $ 2,968.9 | $ 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) | 88.00% | 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 | $ 645.6 | $ 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) | 87.00% | 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 | $ 472.9 | $ 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) | 85.00% | 81.00%

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