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RELATED PARTY TRANSACTIONS AND RELATIONSHIPS (Tables)
 3 Months Ended
Mar. 31, 2019
Related Party Transactions [Abstract]  
Schedule of related party receivables and payables
The following table summarizes Westar Energy's and KCP&L's related party net receivables and payables.
 
 
March 31
 
 
December 31
 
 
 
2019
 
 
2018
 
Westar Energy
 
(millions)
 
Net receivable from GMO
 
$
2.5

 
 
$
2.6

 
Net payable to KCP&L
 
(8.3
)
 
 
(13.5
)
 
Net payable to Evergy
 
(0.5
)
 
 
(1.4
)
 
 
 
 
 
 
 
 
KCP&L
 
 
 
 
 
 
Net receivable from GMO
 
$
53.6

 
 
$
72.6

 
Net receivable from Westar Energy
 
8.3

 
 
13.5

 
Net receivable from Evergy
 
19.3

 
 
15.7