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Investments - Gross Unrealized Losses for Fixed Maturities (Details) $ in Millions | Jun. 30, 2020 USD ($) item | Dec. 31, 2019 USD ($) item
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Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | $ 10,186.8 | $ 5,390.1
Fixed maturities, Less than twelve months, Gross unrealized losses | 535.1 | 63.0
Fixed maturities, Greater than or equal to twelve months, Fair value | 1,182.9 | 3,134.9
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | 73.0 | 61.0
Fixed maturities, Total, Fair value | 11,369.7 | 8,525.0
Fixed maturities, Total, Gross unrealized losses | 608.1 | 124.0
U.S. government and agencies |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | 30.1 | 100.0
Fixed maturities, Less than twelve months, Gross unrealized losses | 0.2 | 1.9
Fixed maturities, Greater than or equal to twelve months, Fair value |  | 74.2
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses |  | 1.1
Fixed maturities, Total, Fair value | 30.1 | 174.2
Fixed maturities, Total, Gross unrealized losses | 0.2 | 3.0
Non-U.S. governments |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | 2.6 | 17.6
Fixed maturities, Less than twelve months, Gross unrealized losses |  | 0.2
Fixed maturities, Greater than or equal to twelve months, Fair value |  | 12.4
Fixed maturities, Total, Fair value | 2.6 | 30.0
Fixed maturities, Total, Gross unrealized losses |  | 0.2
States and political subdivisions |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | 460.5 | 559.9
Fixed maturities, Less than twelve months, Gross unrealized losses | 18.1 | 11.2
Fixed maturities, Greater than or equal to twelve months, Fair value | 21.0 | 86.3
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses |  | 0.4
Fixed maturities, Total, Fair value | 481.5 | 646.2
Fixed maturities, Total, Gross unrealized losses | 18.1 | 11.6
Corporate debt securities |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | 3,521.5 | 1,041.5
Fixed maturities, Less than twelve months, Gross unrealized losses | 248.4 | 27.8
Fixed maturities, Greater than or equal to twelve months, Fair value | 149.7 | 394.7
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | 26.8 | 24.4
Fixed maturities, Total, Fair value | 3,671.2 | 1,436.2
Fixed maturities, Total, Gross unrealized losses | 275.2 | 52.2
Residential mortgage-backed pass-through securities |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | 195.0 | 429.6
Fixed maturities, Less than twelve months, Gross unrealized losses | 0.4 | 1.4
Fixed maturities, Greater than or equal to twelve months, Fair value | 3.2 | 237.3
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses |  | 2.4
Fixed maturities, Total, Fair value | 198.2 | 666.9
Fixed maturities, Total, Gross unrealized losses | 0.4 | 3.8
Commercial mortgage-backed securities |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | 2,507.8 | 829.3
Fixed maturities, Less than twelve months, Gross unrealized losses | 134.3 | 9.2
Fixed maturities, Greater than or equal to twelve months, Fair value | 151.3 | 268.5
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | 15.5 | 14.8
Fixed maturities, Total, Fair value | 2,659.1 | 1,097.8
Fixed maturities, Total, Gross unrealized losses | 149.8 | 24.0
Collateralized debt obligations |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | 2,483.8 | 639.4
Fixed maturities, Less than twelve months, Gross unrealized losses | 62.2 | 1.8
Fixed maturities, Greater than or equal to twelve months, Fair value | 776.7 | 1,447.8
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | 27.3 | 12.5
Fixed maturities, Total, Fair value | 3,260.5 | 2,087.2
Fixed maturities, Total, Gross unrealized losses | 89.5 | 14.3
Other debt obligations |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | 985.5 | 1,772.8
Fixed maturities, Less than twelve months, Gross unrealized losses | 71.5 | 9.5
Fixed maturities, Greater than or equal to twelve months, Fair value | 81.0 | 613.7
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | 3.4 | 5.4
Fixed maturities, Total, Fair value | 1,066.5 | 2,386.5
Fixed maturities, Total, Gross unrealized losses | 74.9 | 14.9
Principal Life Insurance Company |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | 9,843.7 | 5,302.7
Fixed maturities, Less than twelve months, Gross unrealized losses | 502.1 | 44.0
Fixed maturities, Greater than or equal to twelve months, Fair value | 1,175.2 | 3,078.0
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | 72.5 | 59.9
Fixed maturities, Total, Fair value | 11,018.9 | 8,380.7
Fixed maturities, Total, Gross unrealized losses | $ 574.6 | $ 103.9
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) | 81.00% | 97.00%
Available-for-sale Securities in Unrealized Loss Positions, Qualitative Disclosure, Average Price (percent of carrying value to amortized cost) | item | 95 | 99
Available-for-sale Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less Than Twelve Months | item | 1,286 | 882
Available-for-sale Securities in Unrealized Loss Positions, Average Price, Less Than Twelve Months (percent of carrying value to amortized cost) | item | 95 | 99
Available-for-sale Securities in Unrealized Loss Positions, Percent Investment Grade, Less Than Twelve Months (as a percent) | 80.00% | 98.00%
Available-for-sale Securities in Unrealized Loss Position, Aggregate Losses On Investment Grade Investments, Less Than Twelve Months | $ 347.5 | $ 43.1
Available-for-sale Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Twelve Months or Longer | item | 196 | 502
Available-for-sale Securities in Unrealized Loss Positions, Average Price, Twelve Months or Longer (percent of carrying value to amortized cost) | item | 94 | 98
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 | $ 26.8 | $ 23.6
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 | 85 | 94
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 |  | $ 14.6
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
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 | $ 27.1 |
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 | 97 |

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