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Asset Retirement Obligations (Tables)
 9 Months Ended
Sep. 30, 2018
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Change in Asset Retirement Obligation
The following table summarizes the change in the Evergy Companies' AROs for the periods ending September 30, 2018 and December 31, 2017.
 
 
Evergy
 
 
Westar Energy
 
 
KCP&L(a)
 
 
 
2018
 
 
2017
 
 
2018
 
 
2017
 
 
2018
 
 
2017
 
 
 
(millions)
 
Beginning balance, January 1
 
$
405.1

 
 
$
324.0

 
 
$
405.1

 
 
$
324.0

 
 
$
266.3

 
 
$
278.0

 
Liabilities assumed upon merger with Great Plains Energy
 
412.2

 
 
—

 
 
—

 
 
—

 
 
—

 
 
—

 
Liabilities incurred during the year
 
7.4

 
 
13.5

 
 
7.4

 
 
13.5

 
 
—

 
 
—

 
Revision in timing and/or estimates
 
(138.6
)
 
 
66.8

 
 
(133.0
)
 
 
66.8

 
 
(5.7
)
 
 
0.3

 
Settlements
 
(15.9
)
 
 
(16.0
)
 
 
(10.6
)
 
 
(16.0
)
 
 
(9.9
)
 
 
(25.5
)
 
Accretion
 
22.1

 
 
16.8

 
 
14.0

 
 
16.8

 
 
12.6

 
 
13.5

 
Ending balance
 
$
692.3

 
 
$
405.1

 
 
$
282.9

 
 
$
405.1

 
 
$
263.3

 
 
$
266.3

 
Less: current portion
 
(69.6
)
 
 
(25.1
)
 
 
(25.1
)
 
 
(25.1
)
 
 
(40.6
)
 
 
(34.9
)
 
Total noncurrent asset retirement obligation
 
$
622.7

 
 
$
380.0

 
 
$
257.8

 
 
$
380.0

 
 
$
222.7

 
 
$
231.4

 

(a) KCP&L amounts are only included in consolidated Evergy from the date of the closing of the merger, June 4, 2018, through September 30, 2018.