Taxes (Tables)

12 Months Ended

Dec. 31, 2013

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

Great Plains Energy	2013			2012			2011
Current income taxes	(millions)
Federal	$	0.3		$	(3.2	)	$	2.9
State	(3.0		)	(6.3		)	(6.0		)
Foreign	—			—			(0.4		)
Total	(2.7		)	(9.5		)	(3.5		)
Deferred income taxes
Federal	109.1			96.3			90.5
State	24.9			24.9			20.7
Total	134.0			121.2			111.2
Noncurrent income taxes
Federal	—			(0.2		)	(18.0		)
State	(0.3		)	(0.3		)	(2.1		)
Foreign	(0.4		)	(4.2		)	(0.6		)
Total	(0.7		)	(4.7		)	(20.7		)
Investment tax credit
Deferral	0.3			—			—
Amortization	(1.7		)	(2.4		)	(2.2		)
Total	(1.4		)	(2.4		)	(2.2		)
Income tax expense	$	129.2		$	104.6		$	84.8

KCP&L	2013			2012			2011
Current income taxes	(millions)
Federal	$	(0.5	)	$	13.1		$	1.0
State	(0.5		)	2.0			(0.6		)
Total	(1.0		)	15.1			0.4
Deferred income taxes
Federal	75.8			48.8			66.0
State	16.3			11.4			14.6
Total	92.1			60.2			80.6
Noncurrent income taxes
Federal	(9.0		)	1.7			(9.3		)
State	(1.5		)	0.1			(1.1		)
Total	(10.5		)	1.8			(10.4		)
Investment tax credit
Deferral	0.3			—			—
Amortization	(1.1		)	(1.8		)	(1.5		)
Total	(0.8		)	(1.8		)	(1.5		)
Income tax expense	$	79.8		$	75.3		$	69.1

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

Great Plains Energy	2013		2012		2011
Federal statutory income tax rate	35.0	%	35.0	%	35.0	%
Differences between book and tax depreciation not normalized	(0.3	)	1.2		1.5
Amortization of investment tax credits	(0.4	)	(0.8	)	(0.8	)
Federal income tax credits	(3.5	)	(3.1	)	(5.0	)
State income taxes	3.8		4.0		4.0
Changes in uncertain tax positions, net	(0.2	)	(1.5	)	(1.7	)
Valuation allowance	—		—		(0.8	)
Other	(0.4	)	(0.5	)	0.5
Effective income tax rate	34.0	%	34.3	%	32.7	%

KCP&L	2013		2012		2011
Federal statutory income tax rate	35.0	%	35.0	%	35.0	%
Differences between book and tax depreciation not normalized	(0.8	)	1.3		1.6
Amortization of investment tax credits	(0.4	)	(0.8	)	(0.7	)
Federal income tax credits	(5.3	)	(4.3	)	(6.3	)
State income taxes	3.7		4.1		3.9
Changes in uncertain tax positions, net	—		—		0.1
Other	(0.1	)	(0.6	)	0.2
Effective income tax rate	32.1	%	34.7	%	33.8	%

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

	Great Plains Energy						KCP&L
December 31	2013			2012			2013			2012
Current deferred income tax asset (liability)	(millions)
Net operating loss carryforward	$	76.6		$	77.8		$	—		$	—
Other	5.7			12.7			(1.7		)	4.6
Net current deferred income tax asset (liability) before valuation allowance	82.3			90.5			(1.7		)	4.6
Valuation allowance	(2.0		)	(2.0		)	—			—
Net current deferred income tax asset (liability)	80.3			88.5			(1.7		)	4.6
Noncurrent deferred income taxes
Plant related	(1,433.8		)	(1,297.2		)	(1,022.9		)	(930.7		)
Income taxes on future regulatory recoveries	(136.4		)	(138.3		)	(111.0		)	(114.7		)
Derivative instruments	32.3			37.7			23.4			27.4
Pension and post-retirement benefits	(28.2		)	(26.6		)	(1.7		)	(3.4		)
SO2 emission allowance sales	28.8			29.7			28.8			30.4
Tax credit carryforwards	229.3			217.5			139.6			126.3
Customer demand programs	(27.7		)	(28.7		)	(19.4		)	(19.2		)
Net operating loss carryforward	446.7			439.4			71.6			72.4
Other	(57.1		)	(44.1		)	(30.5		)	(24.9		)
Net noncurrent deferred income tax liability before valuation allowance	(946.1		)	(810.6		)	(922.1		)	(836.4		)
Valuation allowance	(18.7		)	(21.8		)	—			—
Net noncurrent deferred income tax liability	(964.8		)	(832.4		)	(922.1		)	(836.4		)
Net deferred income tax liability	$	(884.5	)	$	(743.9	)	$	(923.8	)	$	(831.8	)

	Great Plains Energy						KCP&L
December 31	2013			2012			2013			2012
	(millions)
Gross deferred income tax assets	$	1,148.2		$	1,209.8		$	583.0		$	656.9
Gross deferred income tax liabilities	(2,032.7		)	(1,953.7		)	(1,506.8		)	(1,488.7		)
Net deferred income tax liability	$	(884.5	)	$	(743.9	)	$	(923.8	)	$	(831.8	)

Summary of Income Tax Contingencies [Table Text Block]

	Great Plains Energy									KCP&L
	2013			2012			2011			2013			2012			2011
	(millions)
Beginning balance January 1	$	21.4		$	24.0		$	42.0		$	10.5		$	8.7		$	19.1
Additions for current year tax positions	—			3.7			1.4			—			3.6			—
Reductions for current year tax positions	(0.3		)	—			—			—			—			—
Additions for prior year tax positions	—			—			2.4			—			—			2.3
Reductions for prior year tax positions	(10.5		)	(1.8		)	(20.9		)	(10.5		)	(1.6		)	(12.6		)
Statute expirations	(0.3		)	(4.7		)	(0.7		)	—			(0.2		)	(0.1		)
Foreign currency translation adjustments	(0.5		)	0.2			(0.2		)	—			—			—
Ending balance December 31	$	9.8		$	21.4		$	24.0		$	—		$	10.5		$	8.7