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Separate Account Balances - Separate Account Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023	Dec. 31, 2022
Separate Account Balances
Separate account liabilities	$ 171,399.8	$ 167,605.6
Other balances
Separate Account Balances
Separate account liabilities	280.1	247.9
Retirement and Income Solutions
Separate Account Balances
Separate account liabilities	131,771.5	126,650.4
Retirement and Income Solutions | Group retirement contracts
Separate Account Balances
Separate account liabilities	122,733.7	117,518.5	$ 107,240.1
Retirement and Income Solutions | Individual variable annuities
Separate Account Balances
Separate account liabilities	9,037.8	9,131.9	8,659.0
Principal Asset Management | Principal International
Separate Account Balances
Separate account liabilities	32,849.7	34,724.8
Principal Asset Management | Principal International | Pension | Latin America
Separate Account Balances
Separate account liabilities	32,849.7	34,580.6	33,316.7
Principal Asset Management | Principal International | Guaranteed pension | Asia
Separate Account Balances
Separate account liabilities		144.2	915.0
Benefits and Protection | Life Insurance | Universal life
Separate Account Balances
Separate account liabilities	$ 6,498.5	$ 5,982.5	$ 5,011.0

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