Consolidated Condensed Statements Of Cash Flows (USD $) In Millions	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Cash flows from operating activities
Net income	$ 219.6	$ 182.8
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	243.4	233.7
Deferred income taxes	117.5	136.5
Investment tax credits, net	(0.3)	(0.3)
Allowance for funds used during construction	(0.8)	(1.6)
Non-cash stock compensation	6.6	5.4
Gain on sale of business/assets, pretax	(0.5)	(0.9)
Non-cash debt extinguishment, pretax	0	0.9
Equity in earnings of unconsolidated affiliates, net of cash distributions on earnings	0	6.8
Deferred recovery clauses	3.6	44.6
Receivables, less allowance for uncollectibles	(9.4)	(82.0)
Inventories	39.7	(28.4)
Prepayments and other current assets	(4.4)	(4.3)
Taxes accrued	35.2	38.6
Interest accrued	23.2	23.7
Accounts payable	(26.9)	36.8
Other	25.1	0.7
Cash flows from operating activities	671.6	593.0
Cash flows from investing activities
Capital expenditures	(298.3)	(374.9)
Allowance for funds used during construction	0.8	1.6
Net proceeds from sale of business/assets	3.4	1.4
Net cash increase from consolidation	0	24.1
Contributions to unconsolidated affiliates	0	(1.7)
Other investments	14.4	(13.9)
Cash flows used in investing activities	(279.7)	(363.4)
Cash flows from financing activities
Dividends	(136.8)	(130.7)
Proceeds from the sale of common stock	6.6	5.6
Proceeds from long-term debt issuance	0	543.5
Repayment of long-term debt/Purchase in lieu of redemption	(150.8)	(513.7)
Dividend to noncontrolling interest	(0.6)	(0.7)
Net decrease in short-term debt	(12.0)	(28.0)
Cash flows used in financing activities	(293.6)	(124.0)
Net increase in cash and cash equivalents	98.3	105.6
Cash and cash equivalents at beginning of period	67.5	46.0
Cash and cash equivalents at end of period	165.8	151.6
Tampa Electric Co [Member]
Cash flows from operating activities
Net income	190.4	193.5
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	202.4	195.3
Deferred income taxes	79.0	27.7
Investment tax credits, net	(0.3)	(0.3)
Allowance for funds used during construction	(0.8)	(1.6)
Deferred recovery clauses	3.6	44.6
Receivables, less allowance for uncollectibles	10.9	(69.9)
Inventories	30.1	(31.8)
Prepayments	(2.7)	(1.8)
Taxes accrued	81.4	65.9
Interest accrued	21.9	16.8
Accounts payable	(33.6)	17.7
Gain on sale of assets, pretax	(0.2)	(0.2)
Other	20.1	5.0
Cash flows from operating activities	602.2	460.9
Cash flows from investing activities
Capital expenditures	(248.3)	(295.2)
Allowance for funds used during construction	0.8	1.6
Net proceeds from sale of assets	2.8	0
Cash flows used in investing activities	(244.7)	(293.6)
Cash flows from financing activities
Dividends	(159.3)	(174.9)
Proceeds from the sale of common stock	0	50.0
Repayment of long-term debt/Purchase in lieu of redemption	(78.8)	(3.7)
Net decrease in short-term debt	(12.0)	(28.0)
Cash flows used in financing activities	(250.1)	(156.6)
Net increase in cash and cash equivalents	107.4	10.7
Cash and cash equivalents at beginning of period	3.7	5.5
Cash and cash equivalents at end of period	$ 111.1	$ 16.2