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Accumulation Units (Tables)
 12 Months Ended
Dec. 31, 2017
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,
 
 
2017
 
2016
 
2015
Outstanding:
 
 
 
 
 
 
Beginning of period
 
62.4

 
60.4

 
57.9

Credited for premiums
 
6.6

 
8.2

 
8.1

Annuity, other periodic payments, withdrawals and death benefits
 
(7.7
)
 
(6.2
)
 
(5.6
)
End of period
 
61.3

 
62.4

 
60.4