Consolidated Statements of Cash Flows (unaudited) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash Flows from Operating Activities
Net income	$ 48.8	$ 45.7
Adjustments to reconcile income to net cash from operating activities:
Depreciation and amortization	135.3	140.0
Amortization of:
Nuclear fuel	9.1	5.9
Other Amortization of Deferred Charges	9.2	1.3
Deferred income taxes, net	26.8	36.3
Investment tax credit amortization	(1.2)	(0.8)
Loss from equity investments, net of income taxes	0.1	0.1
Other operating activities	(62.8)	(157.4)
Net cash from operating activities	165.3	71.1
Cash Flows from Investing Activities
Utility capital expenditures	(263.4)	(193.2)
Allowance for borrowed funds used during construction	(2.7)	(2.1)
Purchases of nuclear decommissioning trust investments	(11.7)	(11.2)
Proceeds from nuclear decommissioning trust investments	10.0	9.4
Other investing activities	(7.5)	(13.6)
Net cash from investing activities	(275.3)	(210.7)
Cash Flows from Financing Activities
Issuance of common stock	290.3	3.0
Issuance of long-term debt	0	349.7
Issuance fees	(2.6)	(2.5)
Repayment of long-term debt	(13.4)	(448.3)
Net change in short-term borrowings	(167.0)	295.7
Net change in collateralized short-term borrowings	67.0	0
Dividends paid	(58.7)	(57.2)
Other financing activities	(4.9)	(3.8)
Net cash from financing activities	110.7	136.6
Net Change in Cash and Cash Equivalents	0.7	(3.0)
Cash and Cash Equivalents at Beginning of Year	6.2	10.8
Cash and Cash Equivalents at End of Year	6.9	7.8
Kansas City Power and Light Company [Member]
Cash Flows from Operating Activities
Net income	46.0	37.4
Adjustments to reconcile income to net cash from operating activities:
Depreciation and amortization	91.7	101.6
Amortization of:
Nuclear fuel	9.1	5.9
Other Amortization of Deferred Charges	14.9	14.1
Deferred income taxes, net	20.2	24.4
Investment tax credit amortization	(0.9)	(0.5)
Other operating activities	(26.1)	(95.1)
Net cash from operating activities	154.9	87.8
Cash Flows from Investing Activities
Utility capital expenditures	(208.6)	(143.0)
Allowance for borrowed funds used during construction	(1.4)	(1.2)
Purchases of nuclear decommissioning trust investments	(11.7)	(11.2)
Proceeds from nuclear decommissioning trust investments	10.0	9.4
Net money pool lending	0	12.1
Other investing activities	(6.3)	(7.8)
Net cash from investing activities	(218.0)	(141.7)
Cash Flows from Financing Activities
Repayment of long-term debt	(12.3)	(112.8)
Net change in short-term borrowings	(136.0)	213.2
Net change in collateralized short-term borrowings	11.0	0
Dividends paid	(50.0)	(50.0)
Net money pool borrowings	250.9	2.5
Other financing activities	0	(0.1)
Net cash from financing activities	63.6	52.8
Net Change in Cash and Cash Equivalents	0.5	(1.1)
Cash and Cash Equivalents at Beginning of Year	1.9	3.6
Cash and Cash Equivalents at End of Year	$ 2.4	$ 2.5