Consolidated Condensed Statements Of Cash Flows (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash flows from operating activities
Net income	$ 123.7	$ 129.3
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	167.2	161.0
Deferred income taxes	63.4	69.0
Investment tax credits, net	(0.1)	(0.2)
Allowance for funds used during construction	(0.9)	(0.6)
Non-cash stock compensation	5.3	4.2
Deferred recovery clauses	(12.9)	6.3
Receivables, less allowance for uncollectibles	(2.8)	(2.0)
Inventories	(30.8)	13.8
Prepayments and other current assets	(11.6)	(3.5)
Taxes accrued	31.3	22.3
Interest accrued	3.5	4.6
Accounts payable	(26.9)	(34.6)
Other	(3.0)	17.2
Cash flows from operating activities	305.4	386.8
Cash flows from investing activities
Capital expenditures	(240.9)	(200.2)
Allowance for funds used during construction	0.9	0.6
Other investing activities	0	17.3
Cash flows used in investing activities	(240.0)	(182.3)
Cash flows from financing activities
Dividends	(95.1)	(90.4)
Proceeds from the sale of common stock	3.2	5.4
Proceeds from long-term debt issuance	290.3	0
Repayment of long-term debt/Purchase in lieu of redemption	(210.1)	(144.6)
Dividend to noncontrolling interest	(0.3)	(0.6)
Net increase (decrease) in short-term debt	20.0	20.0
Cash flows from (used in) financing activities	8.0	(210.2)
Net increase (decrease) in cash and cash equivalents	73.4	(5.7)
Cash and cash equivalents at beginning of period	44.0	67.5
Cash and cash equivalents at end of period	117.4	61.8
Tampa Electric Co [Member]
Cash flows from operating activities
Net income	103.4	110.6
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	142.0	134.0
Deferred income taxes	65.3	57.5
Investment tax credits, net	(0.1)	(0.2)
Allowance for funds used during construction	(0.9)	(0.6)
Deferred recovery clauses	(12.9)	6.3
Receivables, less allowance for uncollectibles	(26.5)	16.0
Inventories	(9.6)	13.9
Prepayments	(8.2)	(2.4)
Taxes accrued	49.1	39.3
Interest accrued	3.5	5.2
Accounts payable	(17.3)	(38.3)
Gain on sale of assets, pretax	(0.2)	(0.1)
Other	5.7	15.2
Cash flows from operating activities	293.3	356.4
Cash flows from investing activities
Capital expenditures	(215.6)	(166.3)
Allowance for funds used during construction	0.9	0.6
Net proceeds from sale of business/assets	0.3	2.6
Cash flows used in investing activities	(214.4)	(163.1)
Cash flows from financing activities
Dividends	(94.2)	(105.8)
Proceeds from long-term debt issuance	290.3	0
Repayment of long-term debt/Purchase in lieu of redemption	(204.5)	(75.3)
Net increase (decrease) in short-term debt	0	(5.0)
Cash flows from (used in) financing activities	(8.4)	(186.1)
Net increase (decrease) in cash and cash equivalents	70.5	7.2
Cash and cash equivalents at beginning of period	13.9	3.7
Cash and cash equivalents at end of period	$ 84.4	$ 10.9