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Accumulated Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The following tables reflect the change in the balances of each component of accumulated other comprehensive loss for Great Plains Energy and KCP&L.
Great Plains Energy
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Gains and Losses on Cash Flow Hedges(a)
 
Defined Benefit Pension Items(a)
 
 
Total(a)
 
 
 
(millions)
Three Months Ended March 31, 2016
 
 
 
 
 
 
 
 
 
 
 
 
Beginning balance January 1
 
 
$
(10.1
)
 
 
 
$
(1.9
)
 
 
 
$
(12.0
)
 
Amounts reclassified from accumulated other comprehensive loss
 
 
1.4

 
 
 
0.1

 
 
 
1.5

 
Net current period other comprehensive income
 
 
1.4

 
 
 
0.1

 
 
 
1.5

 
Ending balance March 31
 
 
$
(8.7
)
 
 
 
$
(1.8
)
 
 
 
$
(10.5
)
 
Three Months Ended March 31, 2015
 
 
 
 
 
 
 
 
 
 
 
 
Beginning balance January 1
 
 
$
(15.8
)
 
 
 
$
(2.9
)
 
 
 
$
(18.7
)
 
Amounts reclassified from accumulated other comprehensive loss
 
 
1.4

 
 
 
0.1

 
 
 
1.5

 
Net current period other comprehensive income
 
 
1.4

 
 
 
0.1

 
 
 
1.5

 
Ending balance March 31
 
 
$
(14.4
)
 
 
 
$
(2.8
)
 
 
 
$
(17.2
)
 
(a) Net of tax
KCP&L
 
 
 
 
 
 
Gains and Losses on Cash Flow Hedges(a)
 
 
(millions)
Three Months Ended March 31, 2016
 
 
 
 
Beginning balance January 1
 
 
$
(9.6
)
 
Amounts reclassified from accumulated other comprehensive loss
 
 
1.4

 
Net current period other comprehensive income
 
 
1.4

 
Ending balance March 31
 
 
$
(8.2
)
 
Three Months Ended March 31, 2015
 
 
 
 
Beginning balance January 1
 
 
$
(14.9
)
 
Amounts reclassified from accumulated other comprehensive loss
 
 
1.4

 
Net current period other comprehensive income
 
 
1.4

 
Ending balance March 31
 
 
$
(13.5
)
 
(a) Net of tax
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
The following tables reflect the effect on certain line items of net income from amounts reclassified out of each component of accumulated other comprehensive loss for Great Plains Energy and KCP&L.
Great Plains Energy
 
 
 
 
 
 
Details about Accumulated Other Comprehensive Loss Components
 
Amount Reclassified from Accumulated Other Comprehensive Loss
 
Affected Line Item in the Income Statement
Three Months Ended March 31
 
2016
 
2015
 
 
 
 
(millions)
 
 
Gains and (losses) on cash flow hedges (effective portion)
 
 
 
 
 
 
Interest rate contracts
 
$
(2.3
)
 
$
(2.3
)
 
Interest charges
 
 
(2.3
)
 
(2.3
)
 
Income before income tax expense and income from equity investments
 
 
0.9

 
0.9

 
Income tax benefit
 
 
$
(1.4
)
 
$
(1.4
)
 
Net income
Amortization of defined benefit pension items
 
 
 
 
 
 
Net losses included in net periodic benefit costs
 
$
(0.2
)
 
$
(0.2
)
 
Utility operating and maintenance expenses
 
 
(0.2
)
 
(0.2
)
 
Income before income tax expense and income from equity investments
 
 
0.1

 
0.1

 
Income tax benefit
 
 
$
(0.1
)
 
$
(0.1
)
 
Net income
 
 
 
 
 
 
 
Total reclassifications, net of tax
 
$
(1.5
)
 
$
(1.5
)
 
Net income
KCP&L
 
 
 
 
 
 
Details about Accumulated Other Comprehensive Loss Components
 
Amount Reclassified from Accumulated Other Comprehensive Loss
 
Affected Line Item in the Income Statement
Three Months Ended March 31
 
2016
 
2015
 
 
 
 
(millions)
 
 
Gains and (losses) on cash flow hedges (effective portion)
 
 
 
 
 
 
Interest rate contracts
 
$
(2.3
)
 
$
(2.3
)
 
Interest charges
 
 
(2.3
)
 
(2.3
)
 
Income before income tax expense
 
 
0.9

 
0.9

 
Income tax benefit
Total reclassifications, net of tax
 
$
(1.4
)
 
$
(1.4
)
 
Net income