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Accumulation Units
3 Months Ended
Mar. 31, 2022
Accumulated Units Disclosure [Abstract]  
Accumulation Units Accumulation Units
Changes in the number of Accumulation Units outstanding were as follows (in millions):
For the Three Months Ended March 31, 2022For the Year Ended December 31, 2021
Outstanding:
Beginning of period53.4 52.0 
Credited for premiums1.5 6.4 
Annuity, other periodic payments, withdrawals and death benefits(1.2)(5.0)
End of period53.7 53.4