Consolidated Condensed Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities
Net income	$ 58.0us-gaap_NetIncomeLoss	$ 50.1us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	85.9	84.9
Depreciation and amortization	85.5us-gaap_DepreciationAndAmortization	75.9us-gaap_DepreciationAndAmortization
Deferred income taxes and investment tax credits	36.0	28.8
Allowance for other funds used during construction	(3.8)	(2.4)
Non-cash stock compensation	3.9us-gaap_ShareBasedCompensation	3.7us-gaap_ShareBasedCompensation
Gain on sales of business/assets	0	(0.1)
Deferred recovery clauses	(5.7)	2.6
Receivables, less allowance for uncollectibles	51.0us-gaap_IncreaseDecreaseInReceivables	18.1us-gaap_IncreaseDecreaseInReceivables
Inventories	(15.7)us-gaap_IncreaseDecreaseInInventories	0.4us-gaap_IncreaseDecreaseInInventories
Prepayments and other current assets	(10.9)	(0.2)
Taxes accrued	1.7	15.5
Interest accrued	17.8	22.9
Accounts payable	(63.5)	(25.2)
Other	(7.7)us-gaap_OtherNoncashIncomeExpense	(12.2)us-gaap_OtherNoncashIncomeExpense
Cash flows from operating activities	147.0	186.9
Cash flows from investing activities
Capital expenditures	(160.0)	(136.3)
Allowance for other funds used during construction	3.8	2.4
Other investing activities	(0.2)	0.2
Cash flows used in investing activities	(156.4)	(133.7)
Cash flows from financing activities
Dividends	(53.0)us-gaap_PaymentsOfDividends	(48.0)us-gaap_PaymentsOfDividends
Proceeds from the sale of common stock	2.8	1.6
Net increase (decrease) in short-term debt	67.0	(55.0)
Cash flows from (used) in financing activities	16.8	(101.4)
Net increase (decrease) in cash and cash equivalents	7.4	(48.2)
Cash and cash equivalents at beginning of the period	25.4	185.2
Cash and cash equivalents at end of the period	32.8	137.0
Supplemental disclosure of non-cash activities
Change in accrued capital expenditures	11.5	14.6
Tampa Electric Company [Member]
Cash flows from operating activities
Net income	62.8	59.8
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	76.8	75.4
Deferred income taxes and investment tax credits	21.2	22.7
Allowance for other funds used during construction	(3.8)	(2.4)
Deferred recovery clauses	(4.7)	2.6
Receivables, less allowance for uncollectibles	13.5	12.7
Inventories	(21.1)	9.3
Prepayments	(5.0)	(0.2)
Taxes accrued	72.7	82.4
Interest accrued	22.9	20.9
Accounts payable	(28.3)	(23.3)
Other	(6.9)	(9.1)
Cash flows from operating activities	200.1	250.8
Cash flows from investing activities
Capital expenditures	(152.6)	(132.0)
Allowance for other funds used during construction	3.8	2.4
Cash flows used in investing activities	(148.8)	(129.6)
Cash flows from financing activities
Dividends	(55.7)	(66.1)
Proceeds from the sale of common stock	20.0	7.0
Net increase (decrease) in short-term debt	(11.0)	(55.0)
Cash flows from (used) in financing activities	(46.7)	(114.1)
Net increase (decrease) in cash and cash equivalents	4.6	7.1
Cash and cash equivalents at beginning of the period	10.4	9.8
Cash and cash equivalents at end of the period	15.0	16.9
Supplemental disclosure of non-cash activities
Change in accrued capital expenditures	$ 11.4	$ 14.7

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