Accumulation Units (Tables)

12 Months Ended

Dec. 31, 2021

Accumulated Units Disclosure [Abstract]

Schedule of Changes in the Number of Accumulation Units Outstanding

Changes in the number of Accumulation Units outstanding were as follows (in millions):

	Years ended December 31,
	2021	2020	2019
Outstanding:
Beginning of period	52.0	60.8	60.7
Credited for premiums	6.4	4.6	6.2
Annuity, other periodic payments, withdrawals and death benefits	(5.0)	(13.4)	(6.1)
End of period	53.4	52.0	60.8