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Separate Account Balances - Retirement and Income Solutions (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
Changes in separate account liabilities
Balance at beginning of period	$ 173,327.1
Balance at end of period	171,266.2	$ 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	129,611.7	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	3,578.0	16,573.1
Policy charges	(80.0)	(365.6)
Surrenders, withdrawals and benefit payments	(3,631.5)	(19,191.4)
Investment performance	(2,370.9)	14,632.1
Net transfers (to) from general account	(773.0)	(4,148.3)
Other	26.0	84.7
Balance at end of period	121,851.7	125,103.1
Cash surrender value	120,675.3	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	49.1	344.5
Policy charges	(44.0)	(197.6)
Surrenders, withdrawals and benefit payments	(493.7)	(1,977.7)
Investment performance	(81.0)	1,079.0
Net transfers (to) from general account	(5.3)	(2.1)
Other		(43.1)
Balance at end of period	7,760.0	8,334.9
Cash surrender value	$ 7,649.3	$ 8,219.1

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