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Investments - Gross Unrealized Losses for Fixed Maturities (Details)
$ in Millions
Mar. 31, 2020
USD ($)
item
Dec. 31, 2019
USD ($)
item
Gross Unrealized Losses for Fixed Maturities    
Fixed maturities, Less than twelve months, Fair value $ 24,901.6 $ 5,390.1
Fixed maturities, Less than twelve months, Gross unrealized losses 1,699.5 63.0
Fixed maturities, Greater than or equal to twelve months, Fair value 1,227.6 3,134.9
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses 110.5 61.0
Fixed maturities, Total, Fair value 26,129.2 8,525.0
Fixed maturities, Total, Gross unrealized losses 1,810.0 124.0
U.S. government and agencies    
Gross Unrealized Losses for Fixed Maturities    
Fixed maturities, Less than twelve months, Fair value   100.0
Fixed maturities, Less than twelve months, Gross unrealized losses   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   174.2
Fixed maturities, Total, Gross unrealized losses   3.0
Non-U.S. governments    
Gross Unrealized Losses for Fixed Maturities    
Fixed maturities, Less than twelve months, Fair value 115.4 17.6
Fixed maturities, Less than twelve months, Gross unrealized losses 1.6 0.2
Fixed maturities, Greater than or equal to twelve months, Fair value 5.2 12.4
Fixed maturities, Total, Fair value 120.6 30.0
Fixed maturities, Total, Gross unrealized losses 1.6 0.2
States and political subdivisions    
Gross Unrealized Losses for Fixed Maturities    
Fixed maturities, Less than twelve months, Fair value 812.6 559.9
Fixed maturities, Less than twelve months, Gross unrealized losses 23.7 11.2
Fixed maturities, Greater than or equal to twelve months, Fair value 26.1 86.3
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses 0.3 0.4
Fixed maturities, Total, Fair value 838.7 646.2
Fixed maturities, Total, Gross unrealized losses 24.0 11.6
Corporate debt securities    
Gross Unrealized Losses for Fixed Maturities    
Fixed maturities, Less than twelve months, Fair value 13,248.9 1,041.5
Fixed maturities, Less than twelve months, Gross unrealized losses 1,021.9 27.8
Fixed maturities, Greater than or equal to twelve months, Fair value 150.9 394.7
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses 41.7 24.4
Fixed maturities, Total, Fair value 13,399.8 1,436.2
Fixed maturities, Total, Gross unrealized losses 1,063.6 52.2
Residential mortgage-backed pass-through securities    
Gross Unrealized Losses for Fixed Maturities    
Fixed maturities, Less than twelve months, Fair value 15.1 429.6
Fixed maturities, Less than twelve months, Gross unrealized losses 0.2 1.4
Fixed maturities, Greater than or equal to twelve months, Fair value 3.7 237.3
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses 0.1 2.4
Fixed maturities, Total, Fair value 18.8 666.9
Fixed maturities, Total, Gross unrealized losses 0.3 3.8
Commercial mortgage-backed securities    
Gross Unrealized Losses for Fixed Maturities    
Fixed maturities, Less than twelve months, Fair value 3,691.3 829.3
Fixed maturities, Less than twelve months, Gross unrealized losses 302.2 9.2
Fixed maturities, Greater than or equal to twelve months, Fair value 161.8 268.5
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses 15.5 14.8
Fixed maturities, Total, Fair value 3,853.1 1,097.8
Fixed maturities, Total, Gross unrealized losses 317.7 24.0
Collateralized debt obligations    
Gross Unrealized Losses for Fixed Maturities    
Fixed maturities, Less than twelve months, Fair value 2,419.4 639.4
Fixed maturities, Less than twelve months, Gross unrealized losses 164.5 1.8
Fixed maturities, Greater than or equal to twelve months, Fair value 797.0 1,447.8
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses 45.7 12.5
Fixed maturities, Total, Fair value 3,216.4 2,087.2
Fixed maturities, Total, Gross unrealized losses 210.2 14.3
Other debt obligations    
Gross Unrealized Losses for Fixed Maturities    
Fixed maturities, Less than twelve months, Fair value 4,598.9 1,772.8
Fixed maturities, Less than twelve months, Gross unrealized losses 185.4 9.5
Fixed maturities, Greater than or equal to twelve months, Fair value 82.9 613.7
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses 7.2 5.4
Fixed maturities, Total, Fair value 4,681.8 2,386.5
Fixed maturities, Total, Gross unrealized losses 192.6 14.9
Principal Life Insurance Company    
Gross Unrealized Losses for Fixed Maturities    
Fixed maturities, Less than twelve months, Fair value 24,340.6 5,302.7
Fixed maturities, Less than twelve months, Gross unrealized losses 1,632.4 44.0
Fixed maturities, Greater than or equal to twelve months, Fair value 1,209.3 3,078.0
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses 109.2 59.9
Fixed maturities, Total, Fair value 25,549.9 8,380.7
Fixed maturities, Total, Gross unrealized losses $ 1,741.6 $ 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) 89.00% 97.00%
Available-for-sale Securities in Unrealized Loss Positions, Qualitative Disclosure, Average Price (percent of carrying value to amortized cost) | item 94 99
Available-for-sale Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less Than Twelve Months | item 3,571 882
Available-for-sale Securities in Unrealized Loss Positions, Average Price, Less Than Twelve Months (percent of carrying value to amortized cost) | item 94 99
Available-for-sale Securities in Unrealized Loss Positions, Percent Investment Grade, Less Than Twelve Months (as a percent) 89.00% 98.00%
Available-for-sale Securities in Unrealized Loss Position, Aggregate Losses On Investment Grade Investments, Less Than Twelve Months $ 1,224.3 $ 43.1
Available-for-sale Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Twelve Months or Longer | item 205 502
Available-for-sale Securities in Unrealized Loss Positions, Average Price, Twelve Months or Longer (percent of carrying value to amortized cost) | item 92 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 $ 41.7 $ 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 78 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 $ 45.4  
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