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Pension Plans and Other Employee Benefits (Tables)
 3 Months Ended
Mar. 31, 2014
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Net Benefit Costs [Table Text Block]
The following table provides Great Plains Energy's components of net periodic benefit costs prior to the effects of capitalization and sharing with joint owners of power plants.
 
 
Pension Benefits
 
Other Benefits
Three Months Ended March 31
 
2014
 
2013
 
2014
 
2013
Components of net periodic benefit costs
 
(millions)
Service cost
 
$
9.1

 
$
10.5

 
$
0.9

 
$
1.1

Interest cost
 
12.7

 
11.8

 
2.0

 
1.9

Expected return on plan assets
 
(12.7
)
 
(11.8
)
 
(0.7
)
 
(0.5
)
Prior service cost
 
0.2

 
0.5

 
0.8

 
1.8

Recognized net actuarial loss
 
12.4

 
13.7

 
—

 
0.5

Net periodic benefit costs before regulatory adjustment
 
21.7

 
24.7

 
3.0

 
4.8

Regulatory adjustment
 
(0.4
)
 
(3.6
)
 
1.1

 
(0.5
)
Net periodic benefit costs
 
$
21.3

 
$
21.1

 
$
4.1

 
$
4.3