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Separate Account Balances - Benefits and Protection (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Changes in separate account liabilities
Balance at beginning of period	$ 167,605.6
Balance at end of period	173,327.1	$ 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	557.2	532.1
Policy charges	(132.7)	(129.0)
Surrenders, withdrawals and benefit payments	(492.2)	(342.1)
Investment performance	880.5	902.8
Net transfers (to) from general account	11.4	7.7
Balance at end of period	6,806.7	5,982.5
Cash surrender value	$ 6,869.5	$ 6,041.9

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