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Taxes (Tables)
 6 Months Ended
Jun. 30, 2017
Income Tax Disclosure [Abstract]  
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
Components of income tax expense are detailed in the following tables.

 
Three Months Ended
June 30
Year to Date
June 30
Great Plains Energy
2017
 
2016
2017
 
2016
Current income taxes
(millions)
Federal
$
—

 
$
—

$
—

 
$
(0.1
)
State
(0.2
)
 
0.1

—

 
0.3

Total
(0.2
)
 
0.1

—

 
0.2

Deferred income taxes
 
 
 
 

 
 

Federal
(7.4
)
 
11.7

(11.9
)
 
21.4

State
(1.4
)
 
3.1

(2.5
)
 
5.4

Total
(8.8
)
 
14.8

(14.4
)
 
26.8

Investment tax credit
 
 
 
 
 
 
Deferral
—

 
2.5

—

 
2.5

Amortization
(0.3
)
 
(0.3
)
(0.7
)
 
(0.7
)
Total
(0.3
)
 
2.2

(0.7
)
 
1.8

Income tax expense (benefit)
$
(9.3
)
 
$
17.1

$
(15.1
)
 
$
28.8

 
Three Months Ended
 June 30
Year to Date
June 30
KCP&L
2017
 
2016
2017
 
2016
Current income taxes
(millions)
Federal
$
14.5

 
$
0.8

$
14.4

 
$
1.2

State
2.6

 
0.2

2.6

 
0.3

Total
17.1

 
1.0

17.0

 
1.5

Deferred income taxes
 

 
 

 

 
 

Federal
9.1

 
30.6

16.9

 
39.0

State
2.0

 
6.0

3.4

 
8.0

Total
11.1

 
36.6

20.3

 
47.0

Investment tax credit amortization
(0.2
)
 
(0.3
)
(0.5
)
 
(0.5
)
Income tax expense
$
28.0

 
$
37.3

$
36.8

 
$
48.0
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
Effective Income Tax Rates
Effective income tax rates reflected in the financial statements and the reasons for their differences from the statutory federal rates are detailed in the following tables.
 
Three Months Ended
 June 30
Year to Date
June 30
Great Plains Energy
2017
 
2016
2017
 
2016
Federal statutory income tax rate
35.0
 %
 
35.0
 %
35.0
 %
 
35.0
 %
Differences between book and tax depreciation not normalized
—

 
—

—

 
0.2

Amortization of investment tax credits
(0.8
)
 
(0.7
)
(0.6
)
 
(0.8
)
Federal income tax credits
(3.1
)
 
(5.9
)
(2.3
)
 
(6.8
)
State income taxes
6.3

 
4.2

5.3

 
4.2

Transaction-related costs
19.3

 
—

11.4

 
—

Other
—

 
2.1

(1.2
)
 
1.2

Effective income tax rate
56.7
 %
 
34.7
 %
47.6
 %
 
33.0
 %
 
Three Months Ended
 June 30
Year to Date
June 30
KCP&L
2017
 
2016
2017
 
2016
Federal statutory income tax rate
35.0
 %
 
35.0
 %
35.0
 %
 
35.0
 %
Differences between book and tax depreciation not normalized
(0.2
)
 
(0.1
)
(0.2
)
 
—

Amortization of investment tax credits
(0.4
)
 
(0.3
)
(0.4
)
 
(0.4
)
Federal income tax credits
(1.8
)
 
(2.3
)
(1.8
)
 
(3.7
)
State income taxes
3.8

 
3.9

3.9

 
3.9

Other
(0.3
)
 
(0.1
)
0.1

 
(0.2
)
Effective income tax rate
36.1
 %
 
36.1
 %
36.6
 %
 
34.6
 %

The increase in Great Plains Energy's effective income tax rate for the three months ended and year to date June 30, 2017, compared to the same periods in 2016, is primarily driven by significant transaction-related costs incurred in connection with the anticipated merger with Westar and the previous plan to acquire Westar that are not deductible for tax purposes.