Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Cash Flows from Operating Activities
Net income	$ 172.3	$ 216.7
Adjustments to reconcile income to net cash from operating activities:
Depreciation and amortization	205.9	248.5
Amortization of:
Nuclear fuel	13.5	19.7
Other	7.5	(4.1)
Deferred income taxes, net	124.0	127.0
Investment tax credit amortization	(1.5)	(1.8)
Loss from equity investments, net of income taxes	0.1	0.9
Other operating activities	(154.3)	(199.2)
Net cash from operating activities	367.5	407.7
Cash Flows from Investing Activities
Utility capital expenditures	(317.8)	(465.2)
Allowance for borrowed funds used during construction	(3.1)	(26.9)
Purchases of nuclear decommissioning trust investments	(15.5)	(78.3)
Proceeds from nuclear decommissioning trust investments	13.0	75.6
Other investing activities	(17.4)	(9.1)
Net cash from investing activities	(340.8)	(503.9)
Cash Flows from Financing Activities
Issuance of common stock	4.5	4.7
Issuance of long-term debt	747.1	249.9
Issuance fees	(6.2)	(11.7)
Repayment of long-term debt	(448.5)	(1.3)
Net change in short-term borrowings	(234.5)	(207.1)
Net change in collateralized short-term borrowings	0	95.0
Dividends paid	(85.9)	(85.6)
Other financing activities	(5.1)	(6.0)
Net cash from financing activities	(28.6)	37.9
Net Change in Cash and Cash Equivalents	(1.9)	(58.3)
Cash and Cash Equivalents at Beginning of Year	10.8	65.9
Cash and Cash Equivalents at End of Period	8.9	7.6
KANSAS CITY POWER AND LIGHT CO [Member]
Cash Flows from Operating Activities
Net income	122.8	160.0
Adjustments to reconcile income to net cash from operating activities:
Depreciation and amortization	147.0	192.2
Amortization of:
Nuclear fuel	13.5	19.7
Other	22.3	18.1
Deferred income taxes, net	87.2	63.5
Investment tax credit amortization	(1.0)	(1.2)
Other operating activities	(74.3)	(171.1)
Net cash from operating activities	317.5	281.2
Cash Flows from Investing Activities
Utility capital expenditures	(236.7)	(349.1)
Allowance for borrowed funds used during construction	(1.6)	(21.3)
Purchases of nuclear decommissioning trust investments	(15.5)	(78.3)
Proceeds from nuclear decommissioning trust investments	13.0	75.6
Net money pool lending	(18.8)	6.0
Other investing activities	(9.3)	(6.0)
Net cash from investing activities	(268.9)	(373.1)
Cash Flows from Financing Activities
Issuance of common stock	397.4	0
Issuance fees	(3.7)	(5.0)
Repayment of long-term debt	(113.1)	(0.2)
Net change in short-term borrowings	(253.0)	22.9
Net change in collateralized short-term borrowings	0	95.0
Net money pool borrowings	(1.6)	34.8
Dividends paid	(75.0)	(70.0)
Net cash from financing activities	(49.0)	77.5
Net Change in Cash and Cash Equivalents	(0.4)	(14.4)
Cash and Cash Equivalents at Beginning of Year	3.6	17.4
Cash and Cash Equivalents at End of Period	$ 3.2	$ 3.0