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Separate Account Balances - Benefits and Protection (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Changes in separate account liabilities
Balance at beginning of period	$ 167,605.6
Balance at end of period	171,399.8	$ 167,605.6
Benefits and Protection | Life Insurance | Universal life
Changes in separate account liabilities
Balance at beginning of period	5,982.5	5,011.0
Premiums and deposits	306.4	532.1
Policy charges	(66.5)	(129.0)
Surrenders, withdrawals and benefit payments	(249.4)	(342.1)
Investment performance	516.1	902.8
Net transfers (to) from general account	9.4	7.7
Balance at end of period	6,498.5	5,982.5
Cash surrender value	$ 6,554.7	$ 6,041.9

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Amount of separate account liability payable to policyholder upon surrender of contract before maturity.

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Amount of liability for variable contract in which all or portion of contract holder's funds is allocated to specific separate account and supported by assets held in separate account.

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