Accumulated Other Comprehensive Income (Loss) (Tables)

12 Months Ended

Dec. 31, 2017

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 income (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)
2017
Beginning balance January 1		$	(4.5	)		$	(2.1	)	$	(6.6	)
Other comprehensive loss before reclassification		—				(0.9		)	(0.9		)
Amounts reclassified from accumulated other comprehensive loss		4.9				0.4			5.3
Net current period other comprehensive income (loss)		4.9				(0.5		)	4.4
Ending balance December 31		$	0.4			$	(2.6	)	$	(2.2	)
2016
Beginning balance January 1		$	(10.1	)		$	(1.9	)	$	(12.0	)
Other comprehensive loss before reclassifications		—				(0.7		)	(0.7		)
Amounts reclassified from accumulated other comprehensive loss		5.6				0.5			6.1
Net current period other comprehensive income (loss)		5.6				(0.2		)	5.4
Ending balance December 31		$	(4.5	)		$	(2.1	)	$	(6.6	)

^(a) Net of tax



KCP&L
	Gains and Losses on Cash Flow Hedges^(a)
	(millions)
2017
Beginning balance January 1		$	(4.2	)
Amounts reclassified from accumulated other comprehensive loss		4.6
Net current period other comprehensive income		4.6
Ending balance December 31		$	0.4
2016
Beginning balance January 1		$	(9.6	)
Amounts reclassified from accumulated other comprehensive loss		5.4
Net current period other comprehensive income		5.4
Ending balance December 31		$	(4.2	)

^(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 income (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
	2017			2016
	(millions)
Gains (losses) on cash flow hedges (effective portion)
Interest rate contracts	$	(7.9	)	$	(9.2	)	Interest charges
	(7.9		)	(9.2		)	Income before income tax expense and income from equity investments
	3.0			3.6			Income tax benefit
	$	(4.9	)	$	(5.6	)	Net income (loss)
Amortization of defined benefit pension items
Net losses included in net periodic benefit costs	$	(0.7	)	$	(0.8	)	Utility operating and maintenance expenses
	(0.7		)	(0.8		)	Income before income tax expense and income from equity investments
	0.3			0.3			Income tax benefit
	$	(0.4	)	$	(0.5	)	Net income (loss)

Total reclassifications, net of tax	$	(5.3	)	$	(6.1	)	Net income (loss)



KCP&L
Details about Accumulated Other Comprehensive Loss Components	Amount Reclassified from Accumulated Other Comprehensive Income (Loss)						Affected Line Item in the Income Statement
	2017			2016
	(millions)
Gains (losses) on cash flow hedges (effective portion)
Interest rate contracts	$	(7.5	)	$	(8.8	)	Interest charges
	(7.5		)	(8.8		)	Income before income tax expense
	2.9			3.4			Income tax benefit
Total reclassifications, net of tax	$	(4.6	)	$	(5.4	)	Net income

GREAT PLAINS ENERGY INC 10-K