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Separate Account Balances - Retirement and Income Solutions (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Changes in separate account liabilities
Balance at beginning of period	$ 173,327.1
Balance at end of period	189,251.5	$ 173,327.1
Retirement and Income Solutions
Changes in separate account liabilities
Balance at beginning of period	133,438.0
Balance at end of period	142,972.7	133,438.0
Retirement and Income Solutions | Group retirement contracts
Changes in separate account liabilities
Balance at beginning of period	125,103.1	117,518.5
Premiums and deposits	11,249.3	16,573.1
Policy charges	(261.4)	(365.6)
Surrenders, withdrawals and benefit payments	(12,155.7)	(19,191.4)
Investment performance	13,266.6	14,632.1
Net transfers (to) from general account	(1,870.7)	(4,148.3)
Other	(34.7)	84.7
Balance at end of period	135,296.5	125,103.1
Cash surrender value	134,152.0	123,965.4
Retirement and Income Solutions | Individual variable annuities
Changes in separate account liabilities
Balance at beginning of period	8,334.9	9,131.9
Premiums and deposits	122.9	344.5
Policy charges	(126.7)	(197.6)
Surrenders, withdrawals and benefit payments	(1,357.0)	(1,977.7)
Investment performance	721.2	1,079.0
Net transfers (to) from general account	(19.1)	(2.1)
Other		(43.1)
Balance at end of period	7,676.2	8,334.9
Cash surrender value	$ 7,571.7	$ 8,219.1

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