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Investments - Gross Unrealized Losses for Fixed Maturities (Details) $ in Millions | Mar. 31, 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 | $ 27,258.4 | $ 45,651.0
Fixed maturities, Less than twelve months, Gross unrealized losses | 2,296.0 | 6,183.1
Fixed maturities, Greater than or equal to twelve months, Fair value | 26,097.6 | 8,850.9
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | 4,343.9 | 1,695.2
Fixed maturities, Total, Fair value | 53,356.0 | 54,501.9
Fixed maturities, Total, Gross unrealized losses | 6,639.9 | 7,878.3
U.S. government and agencies |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | 879.6 | 1,528.3
Fixed maturities, Less than twelve months, Gross unrealized losses | 86.0 | 209.4
Fixed maturities, Greater than or equal to twelve months, Fair value | 605.2 | 181.5
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | 127.3 | 41.8
Fixed maturities, Total, Fair value | 1,484.8 | 1,709.8
Fixed maturities, Total, Gross unrealized losses | 213.3 | 251.2
Non-U.S. governments |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | 257.4 | 407.5
Fixed maturities, Less than twelve months, Gross unrealized losses | 21.4 | 57.7
Fixed maturities, Greater than or equal to twelve months, Fair value | 131.5 | 19.9
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | 34.5 | 7.1
Fixed maturities, Total, Fair value | 388.9 | 427.4
Fixed maturities, Total, Gross unrealized losses | 55.9 | 64.8
States and political subdivisions |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | 3,191.6 | 5,303.5
Fixed maturities, Less than twelve months, Gross unrealized losses | 372.3 | 1,008.9
Fixed maturities, Greater than or equal to twelve months, Fair value | 2,251.2 | 391.9
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | 537.3 | 127.8
Fixed maturities, Total, Fair value | 5,442.8 | 5,695.4
Fixed maturities, Total, Gross unrealized losses | 909.6 | 1,136.7
Corporate debt securities |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | 17,165.8 | 27,309.5
Fixed maturities, Less than twelve months, Gross unrealized losses | 1,571.1 | 3,944.6
Fixed maturities, Greater than or equal to twelve months, Fair value | 12,333.1 | 2,944.1
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | 2,303.7 | 698.0
Fixed maturities, Total, Fair value | 29,498.9 | 30,253.6
Fixed maturities, Total, Gross unrealized losses | 3,874.8 | 4,642.6
Residential mortgage-backed pass-through securities |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | 616.0 | 1,201.7
Fixed maturities, Less than twelve months, Gross unrealized losses | 16.4 | 97.5
Fixed maturities, Greater than or equal to twelve months, Fair value | 1,159.9 | 574.8
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | 156.5 | 105.7
Fixed maturities, Total, Fair value | 1,775.9 | 1,776.5
Fixed maturities, Total, Gross unrealized losses | 172.9 | 203.2
Commercial mortgage-backed securities |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | 996.4 | 3,648.5
Fixed maturities, Less than twelve months, Gross unrealized losses | 78.4 | 484.0
Fixed maturities, Greater than or equal to twelve months, Fair value | 3,749.0 | 1,124.8
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | 548.6 | 222.5
Fixed maturities, Total, Fair value | 4,745.4 | 4,773.3
Fixed maturities, Total, Gross unrealized losses | 627.0 | 706.5
Collateralized debt obligations |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | 1,738.4 | 2,832.2
Fixed maturities, Less than twelve months, Gross unrealized losses | 33.5 | 89.0
Fixed maturities, Greater than or equal to twelve months, Fair value | 2,484.8 | 1,330.1
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | 97.5 | 54.7
Fixed maturities, Total, Fair value | 4,223.2 | 4,162.3
Fixed maturities, Total, Gross unrealized losses | 131.0 | 143.7
Other debt obligations |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | 2,413.2 | 3,419.8
Fixed maturities, Less than twelve months, Gross unrealized losses | 116.9 | 292.0
Fixed maturities, Greater than or equal to twelve months, Fair value | 3,382.9 | 2,283.8
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | 538.5 | 437.6
Fixed maturities, Total, Fair value | 5,796.1 | 5,703.6
Fixed maturities, Total, Gross unrealized losses | 655.4 | 729.6
Principal Life Insurance Company |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | 26,573.1 | 44,857.0
Fixed maturities, Less than twelve months, Gross unrealized losses | 2,243.3 | 6,096.3
Fixed maturities, Greater than or equal to twelve months, Fair value | 25,409.5 | 8,496.1
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | 4,250.5 | 1,645.1
Fixed maturities, Total, Fair value | 51,982.6 | 53,353.1
Fixed maturities, Total, Gross unrealized losses | $ 6,493.8 | $ 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 | item | 4,895 | 7,589
Available-for-sale Securities in Unrealized Loss Positions, Average Price, Less Than Twelve Months (percent of carrying value to amortized cost) | 92.00% | 88.00%
Available-for-sale Securities in Unrealized Loss Positions, Percent Investment Grade, Less Than Twelve Months (as a percent) | 94.00% | 95.00%
Available-for-sale Securities in Unrealized Loss Position, Aggregate Losses On Investment Grade Investments, Less Than Twelve Months | $ 2,170.6 | $ 5,920.4
Available-for-sale Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Twelve Months or Longer | item | 5,130 | 1,654
Available-for-sale Securities in Unrealized Loss Positions, Average Price, Twelve Months or Longer (percent of carrying value to amortized cost) | 86.00% | 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 | $ 530.8 | $ 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) | 81.00% | 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 | $ 2,228.7 | $ 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) | 84.00% | 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 | $ 544.5 | $ 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 | $ 415.0 | $ 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) | 84.00% | 81.00%

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