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Accumulation Units
 12 Months Ended
Dec. 31, 2019
Accumulated Units Disclosure [Abstract]  
Accumulation Units
Accumulation Units
Changes in the number of Accumulation Units outstanding were as follows (millions):
 
 
Years ended December 31,
 
 
2019
 
2018
 
2017
Outstanding:
 
 
 
 
 
 
Beginning of period
 
60.7

 
61.3

 
62.4

Credited for premiums
 
6.2

 
6.5

 
6.6

Annuity, other periodic payments, withdrawals and death benefits
 
(6.1
)
 
(7.1
)
 
(7.7
)
End of period
 
60.8

 
60.7

 
61.3