Consolidated Condensed Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities
Net income	$ 123.0	$ 119.6
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	261.5	255.7
Depreciation and amortization	260.3	230.0
Deferred income taxes and investment tax credits	84.6	58.4
Allowance for other funds used during construction	(12.2)	(7.3)
Non-cash stock compensation	10.1	10.2
Loss (gain) on sales of business/assets, pretax	10.0	(0.2)
Deferred recovery clauses	13.1	(5.5)
Asset impairment, pretax	78.6	98.4
Receivables, less allowance for uncollectibles	46.1	(25.9)
Inventories	(45.7)	(9.6)
Prepayments and other current assets	(14.2)	(5.5)
Taxes accrued	31.6	48.6
Interest accrued	14.7	27.8
Accounts payable	(85.7)	(29.4)
Other	(36.1)	(29.1)
Cash flows from operating activities	479.4	506.2
Cash flows from investing activities
Capital expenditures	(523.2)	(491.8)
Allowance for other funds used during construction	12.2	7.3
Purchase of NMGI, net of cash acquired	0.0	(752.5)
Other investing activities	(0.2)	0.3
Cash flows used in investing activities	(511.2)	(1,236.7)
Cash flows from financing activities
Dividends	(158.8)	(147.5)
Proceeds from the sale of common stock	6.4	296.6
Proceeds from long-term debt issuance	499.7	564.2
Repayment of long-term debt	(274.5)	(83.3)
Net decrease in short-term debt	(11.0)	(12.0)
Cash flows from financing activities	61.8	618.0
Net increase (decrease) in cash and cash equivalents	30.0	(112.5)
Cash and cash equivalents at beginning of the period	25.4	185.2
Cash and cash equivalents at end of the period	55.4	72.7
Supplemental disclosure of non-cash activities
Debt assumed in NMGI acquisition	0.0	200.0
Change in accrued capital expenditures	(8.1)	10.2
Tampa Electric Company [Member]
Cash flows from operating activities
Net income	226.4	214.0
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	233.8	225.9
Deferred income taxes and investment tax credits	52.6	50.1
Allowance for other funds used during construction	(12.1)	(7.3)
Deferred recovery clauses	13.7	(6.0)
Receivables, less allowance for uncollectibles	(31.4)	(39.2)
Inventories	(44.4)	18.0
Prepayments	(7.9)	(6.6)
Taxes accrued	93.6	113.3
Interest accrued	24.5	24.3
Accounts payable	(39.8)	(24.1)
Other	(34.4)	(23.3)
Cash flows from operating activities	474.6	539.1
Cash flows from investing activities
Capital expenditures	(485.9)	(475.8)
Allowance for other funds used during construction	12.1	7.3
Cash flows used in investing activities	(473.8)	(468.5)
Cash flows from financing activities
Dividends	(175.9)	(169.8)
Proceeds from the sale of common stock	88.0	19.5
Proceeds from long-term debt issuance	251.2	296.3
Repayment of long-term debt	(83.3)	(83.3)
Net decrease in short-term debt	(58.0)	(84.0)
Cash flows from financing activities	22.0	(21.3)
Net increase (decrease) in cash and cash equivalents	22.8	49.3
Cash and cash equivalents at beginning of the period	10.4	9.8
Cash and cash equivalents at end of the period	33.2	59.1
Supplemental disclosure of non-cash activities
Change in accrued capital expenditures	$ (10.1)	$ 11.0