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Accumulation Units (Tables)
 3 Months Ended
Mar. 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):
 
For the Three Months Ended March 31, 2017
 
For the Year Ended December 31, 2016
 
(Unaudited)
 
 
Outstanding:
 
 
 
Beginning of period
62.4

 
60.4

Credited for premiums
2.0

 
8.2

Annuity, other periodic payments, withdrawals and death benefits
(1.8
)
 
(6.2
)
End of period
62.6

 
62.4