Consolidated Condensed Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities
Net income	$ 73.8	$ 58.0
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	89.8	85.9
Depreciation and amortization	89.8	85.5
Deferred income taxes and investment tax credits	36.1	36.0
Allowance for other funds used during construction	(5.7)	(3.8)
Non-cash stock compensation	3.0	3.9
Deferred recovery clauses	26.4	(5.7)
Receivables, less allowance for uncollectibles	40.6	51.0
Inventories	(5.2)	(15.7)
Prepayments and other current assets	2.8	(10.9)
Taxes accrued	18.1	1.7
Interest accrued	17.8	17.8
Accounts payable	(59.1)	(63.5)
Other	(6.8)	(7.7)
Cash flows from operating activities	231.6	147.0
Cash flows from investing activities
Capital expenditures	(168.0)	(156.2)
Other investing activities	(0.2)	(0.2)
Cash flows used in investing activities	(168.2)	(156.4)
Cash flows from financing activities
Dividends and dividend equivalents	(54.3)	(53.0)
Proceeds from the sale of common stock	3.9	2.8
Repayment of long-term debt/purchase in lieu of redemption	(250.0)	0.0
Net increase (decrease) in short-term debt (maturities of 90 days or less)	(134.0)	67.0
Proceeds from other short-term debt (maturities over 90 days)	400.0	0.0
Other financing activities	(6.7)	0.0
Cash flows from (used in) financing activities	(41.1)	16.8
Net increase in cash and cash equivalents	22.3	7.4
Cash and cash equivalents at beginning of the period	23.8	25.4
Cash and cash equivalents at end of the period	46.1	32.8
Supplemental disclosure of non-cash activities
Change in accrued capital expenditures	(6.0)	11.5
Tampa Electric Company [Member]
Cash flows from operating activities
Net income	63.3	62.8
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	80.9	76.8
Deferred income taxes and investment tax credits	30.4	21.2
Allowance for other funds used during construction	(5.6)	(3.8)
Deferred recovery clauses	27.0	(4.7)
Receivables, less allowance for uncollectibles	24.7	13.5
Inventories	(10.3)	(21.1)
Prepayments and other current assets	4.6	(5.0)
Taxes accrued	81.7	72.7
Interest accrued	24.3	22.9
Accounts payable	(41.2)	(28.3)
Other	(11.6)	(6.9)
Cash flows from operating activities	268.2	200.1
Cash flows from investing activities
Capital expenditures	(150.5)	(148.8)
Cash flows used in investing activities	(150.5)	(148.8)
Cash flows from financing activities
Dividends and dividend equivalents	(62.6)	(55.7)
Proceeds from the sale of common stock	25.0	20.0
Net increase (decrease) in short-term debt (maturities of 90 days or less)	(61.0)	(11.0)
Cash flows from (used in) financing activities	(98.6)	(46.7)
Net increase in cash and cash equivalents	19.1	4.6
Cash and cash equivalents at beginning of the period	9.1	10.4
Cash and cash equivalents at end of the period	28.2	15.0
Supplemental disclosure of non-cash activities
Change in accrued capital expenditures	$ (4.8)	$ 11.4