Consolidated Condensed Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities
Net income	$ 79.1	$ 69.8
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	180.0	173.3
Depreciation and amortization	180.0	172.5
Deferred income taxes and investment tax credits	60.3	46.9
Allowance for other funds used during construction	(11.6)	(7.5)
Non-cash stock compensation	6.4	6.9
Loss on disposals of business/assets, pretax	0.3	0.0
Deferred recovery clauses	42.5	(4.1)
Asset impairment, pretax	0.0	78.6
Receivables, less allowance for uncollectibles	24.2	39.8
Inventories	4.6	(37.2)
Prepayments and other current assets	2.9	(12.2)
Taxes accrued	35.9	19.0
Interest accrued	(1.9)	(1.8)
Accounts payable	55.7	(58.3)
Other	(20.2)	(15.1)
Cash flows from operating activities	458.2	298.1
Cash flows from investing activities
Capital expenditures	(384.8)	(335.7)
Net proceeds from sale of business/assets	8.7	0.0
Other investing activities	(0.2)	(0.1)
Cash flows used in investing activities	(376.3)	(335.8)
Cash flows from financing activities
Dividends and dividend equivalents	(108.6)	(105.9)
Proceeds from the sale of common stock	4.1	3.5
Proceeds from long-term debt issuance	0.0	500.0
Repayment of long-term debt	(333.3)	(274.5)
Net decrease in short-term debt (maturities of 90 days or less)	(32.0)	(53.5)
Proceeds from other short-term debt (maturities over 90 days)	400.0	0.0
Other financing activities	(6.7)	(1.3)
Cash flows from (used in) financing activities	(76.5)	68.3
Net increase in cash and cash equivalents	5.4	30.6
Cash and cash equivalents at beginning of the period	23.8	25.4
Cash and cash equivalents at end of the period	29.2	56.0
Supplemental disclosure of non-cash activities
Change in accrued capital expenditures	(14.2)	1.6
Dividends declared and not paid	26.8	0.0
Tampa Electric Company [Member]
Cash flows from operating activities
Net income	139.0	138.1
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	162.3	154.8
Deferred income taxes and investment tax credits	36.5	30.0
Allowance for other funds used during construction	(11.6)	(7.5)
Deferred recovery clauses	41.0	(3.2)
Receivables, less allowance for uncollectibles	(8.5)	(24.4)
Inventories	1.4	(42.1)
Prepayments and other current assets	4.3	(6.2)
Taxes accrued	120.3	93.1
Interest accrued	0.8	2.0
Accounts payable	3.6	(14.3)
Other	(25.9)	(14.9)
Cash flows from operating activities	463.2	305.4
Cash flows from investing activities
Capital expenditures	(353.8)	(312.4)
Cash flows used in investing activities	(345.1)	(312.4)
Net proceeds from sale of assets	8.7	0.0
Cash flows from financing activities
Dividends and dividend equivalents	(182.1)	(109.5)
Proceeds from the sale of common stock	90.0	30.0
Proceeds from long-term debt issuance	0.0	251.3
Repayment of long-term debt	(83.3)	(83.3)
Net decrease in short-term debt (maturities of 90 days or less)	62.0	(58.0)
Cash flows from (used in) financing activities	(113.4)	30.5
Net increase in cash and cash equivalents	4.7	23.5
Cash and cash equivalents at beginning of the period	9.1	10.4
Cash and cash equivalents at end of the period	13.8	33.9
Supplemental disclosure of non-cash activities
Change in accrued capital expenditures	$ (13.9)	$ 1.5