Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities
Net income	$ 197.7	$ 212.7	$ 272.6
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	329.5	337.7	324.6
Deferred income taxes	110.4	136.9	146.0
Investment tax credits	(0.3)	(0.3)	(0.4)
Allowance for other funds used during construction	(6.3)	(2.6)	(1.0)
Non-cash stock compensation	13.5	12.0	9.1
(Gain) loss on sales of business/assets, pretax	(1.6)	18.5	(0.5)
Deferred recovery clauses	(6.2)	(8.9)	(9.0)
Asset impairment, pretax	0	17.2	0
Receivables, less allowance for uncollectibles	(4.5)	37.7	5.7
Inventories	1.1	(2.4)	23.5
Prepayments and other current assets	(2.2)	(2.0)	(2.8)
Taxes accrued	1.4	12.1	(5.7)
Interest accrued	(1.3)	(5.9)	0.3
Accounts payable	35.9	(1.3)	(42.6)
Other	(8.5)	(4.7)	34.3
Cash flows from operating activities	658.6	756.7	754.1
Cash flows from investing activities
Capital expenditures	(532.4)	(505.1)	(454.1)
Allowance for other funds used during construction	6.3	2.6	1.0
Net proceeds from sales of business/assets	4.3	194.4	3.5
Restricted cash	0	8.9	0
Other investing activities	0	0	14.4
Cash flows used in investing activities	(521.8)	(299.2)	(435.2)
Cash flows from financing activities
Dividends	(191.2)	(190.4)	(183.2)
Proceeds from the sale of common stock	6.7	3.9	7.0
Proceeds from long-term debt issuance	0	538.1	0
Repayment of long-term debt/Purchase in lieu of redemption	(51.6)	(650.4)	(153.6)
Change in short-term debt	84.0	0	(12.0)
Other financing activities	0	(2.2)	(0.6)
Cash flows used in financing activities	(152.1)	(301.0)	(342.4)
Net (decrease) increase in cash and cash equivalents	(15.3)	156.5	(23.5)
Cash and cash equivalents at beginning of the year	200.5	44.0	67.5
Cash and cash equivalents at end of the year	185.2	200.5	44.0
Supplemental disclosure of cash flow information
Interest	161.0	188.4	191.6
Income taxes paid	1.8	7.2	9.4
Tampa Electric Company [Member]
Cash flows from operating activities
Net income	225.6	227.2	235.3
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	290.3	288.2	270.5
Deferred income taxes	118.4	155.9	173.6
Investment tax credits	(0.3)	(0.3)	(0.4)
Allowance for other funds used during construction	(6.3)	(2.6)	(1.0)
(Gain) loss on sales of business/assets, pretax	0	(0.2)	(0.3)
Deferred recovery clauses	(6.2)	(8.9)	(9.0)
Receivables, less allowance for uncollectibles	(13.8)	1.6	47.8
Inventories	(9.0)	4.1	12.6
Prepayments	(1.0)	(1.0)	(0.5)
Taxes accrued	(34.3)	(5.7)	7.9
Interest accrued	(0.9)	(8.3)	1.0
Accounts payable	34.8	12.4	(42.2)
Other	(1.8)	5.2	29.4
Cash flows from operating activities	595.5	667.6	724.7
Cash flows from investing activities
Capital expenditures	(507.6)	(459.0)	(386.8)
Allowance for other funds used during construction	6.3	2.6	1.0
Net proceeds from sale of assets	0.1	0.3	2.8
Cash flows used in investing activities	(501.2)	(456.1)	(383.0)
Cash flows from financing activities
Dividends	(222.1)	(228.3)	(240.7)
Proceeds from the sale of common stock	60.0	118.0	0
Proceeds from long-term debt issuance	0	538.1	0
Repayment of long-term debt/Purchase in lieu of redemption	(51.6)	(608.0)	(78.8)
Change in short-term debt	84.0	0	(12.0)
Cash flows used in financing activities	(129.7)	(180.2)	(331.5)
Net (decrease) increase in cash and cash equivalents	(35.4)	31.3	10.2
Cash and cash equivalents at beginning of the year	45.2	13.9	3.7
Cash and cash equivalents at end of the year	9.8	45.2	13.9
Supplemental disclosure of cash flow information
Interest	102.4	128.1	129.0
Income taxes paid	$ 56.4	$ (9.7)	$ (31.1)