Consolidated Condensed Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities
Net income	$ 148.5	$ 123.0
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	272.0	261.5
Depreciation and amortization	272.0	260.3
Deferred income taxes and investment tax credits	76.5	84.6
Allowance for other funds used during construction	(18.1)	(12.2)
Non-cash stock compensation	6.4	10.1
Loss on disposals of business/assets, pretax	(0.3)	10.0
Deferred recovery clauses	54.5	13.1
Asset impairment, pretax	0.0	78.6
Receivables, less allowance for uncollectibles	12.5	46.1
Inventories	21.3	(45.7)
Prepayments and other current assets	6.8	(14.2)
Taxes accrued	54.0	31.6
Interest accrued	16.9	14.7
Accounts payable	27.7	(85.7)
Other	(27.6)	(34.6)
Cash flows from operating activities	651.1	480.9
Cash flows from investing activities
Capital expenditures	(573.3)	(511.0)
Other investing activities	8.5	(0.2)
Cash flows used in investing activities	(564.8)	(511.2)
Cash flows from financing activities
Dividends and dividend equivalents	(135.4)	(158.8)
Proceeds from the sale of common stock and equity contributions	26.2	6.4
Proceeds from long-term debt issuance	0.0	499.7
Repayment of long-term debt	(333.3)	(274.5)
Net decrease in short-term debt (maturities of 90 days or less)	(36.5)	(11.0)
Proceeds from other short-term debt (maturities over 90 days)	400.0	0.0
Other financing activities	(6.7)	(1.5)
Cash flows from (used in) financing activities	(85.7)	60.3
Net increase in cash and cash equivalents	0.6	30.0
Cash and cash equivalents at beginning of the period	23.8	25.4
Cash and cash equivalents at end of the period	24.4	55.4
Supplemental disclosure of non-cash activities
Change in accrued capital expenditures	(20.6)	(8.1)
Tampa Electric Company [Member]
Cash flows from operating activities
Net income	239.6	226.4
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	245.1	233.8
Deferred income taxes and investment tax credits	69.8	52.6
Allowance for other funds used during construction	(17.8)	(12.1)
Deferred recovery clauses	54.3	13.7
Receivables, less allowance for uncollectibles	(24.7)	(31.4)
Inventories	17.8	(44.4)
Prepayments and other current assets	6.4	(7.9)
Taxes accrued	122.6	93.6
Interest accrued	23.2	24.5
Accounts payable	18.6	(39.8)
Other	(52.3)	(34.4)
Cash flows from operating activities	702.6	474.6
Cash flows from investing activities
Capital expenditures	(517.6)	(473.8)
Net proceeds from sale of assets	8.7	0.0
Cash flows used in investing activities	(508.9)	(473.8)
Cash flows from financing activities
Dividends and dividend equivalents	(182.1)	(175.9)
Common stock	90.0	88.0
Proceeds from long-term debt issuance	0.0	251.2
Repayment of long-term debt	(83.3)	(83.3)
Net decrease in short-term debt (maturities of 90 days or less)	(12.0)	(58.0)
Cash flows from (used in) financing activities	(187.4)	22.0
Net increase in cash and cash equivalents	6.3	22.8
Cash and cash equivalents at beginning of the period	9.1	10.4
Cash and cash equivalents at end of the period	15.4	33.2
Supplemental disclosure of non-cash activities
Change in accrued capital expenditures	$ (19.6)	$ (10.1)