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Separate Account Balances - Benefits and Protection (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2022
Changes in separate account liabilities
Balance at beginning of period	$ 155,375.1
Balance at end of period	164,210.6	$ 155,375.1
Benefits and Protection | Life Insurance | Universal life
Changes in separate account liabilities
Balance at beginning of period	5,011.0	5,886.1
Premiums and deposits	275.1	514.7
Policy charges	(64.1)	(122.1)
Surrenders, withdrawals and benefit payments	(188.1)	(208.6)
Investment performance	542.0	(1,054.5)
Net transfers (to) from general account	7.7	(4.6)
Balance at end of period	5,583.6	5,011.0
Cash surrender value	$ 5,638.3	$ 5,055.8

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Amount of decrease in separate account liability from contract redemption and withdrawal of funds and cash outflow to separate account policyholder from benefit payment.

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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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