Consolidated Statements of Income (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues
Regulated electric and gas (includes franchise fees and gross receipts taxes of $108.5 in 2013, $111.5 in 2012 and $109.3 in 2011)	$ 2,342.5	$ 2,377.4	$ 2,469.8
Unregulated	508.8	619.2	740.1
Total revenues	2,851.3	2,996.6	3,209.9
Expenses
Fuel	680.2	694.7	731.4
Purchased power	64.7	105.3	125.9
Cost of natural gas sold	142.2	155.7	210.4
Other	524.4	462.5	436.9
Operation and maintenance other expense
Mining related costs	419.0	461.1	574.1
Other	12.5	7.9	7.1
Depreciation and amortization	329.5	330.6	317.2
Taxes, other than income	215.1	222.3	223.7
Total expenses	2,387.6	2,440.1	2,626.7
Income from operations	463.7	556.5	583.2
Other income (expense)
Allowance for other funds used during construction	6.3	2.6	1.0
Other income	3.6	9.4	6.7
Loss on debt extinguishment	0	(1.2)	0
Total other income	9.9	10.8	7.7
Interest charges
Interest expense	170.5	185.0	198.0
Allowance for borrowed funds used during construction	(3.6)	(1.5)	(0.6)
Total interest charges	166.9	183.5	197.4
Income from continuing operations before provision for income taxes	306.7	383.8	393.5
Provision for income taxes	108.9	137.8	142.7
Net income from continuing operations	197.8	246.0	250.8
Discontinued operations
Income (loss) from discontinued operations	(0.2)	(10.6)	33.3
Provision for income taxes	(0.1)	22.4	11.2
Income (loss) from discontinued operations, net	(0.1)	(33.0)	22.1
Less: Income from discontinued operations attributable to noncontrolling interest	0	0.3	0.3
Income (loss) from discontinued operations attributable to TECO Energy, net	(0.1)	(33.3)	21.8
Net income attributable to TECO Energy	$ 197.7	$ 212.7	$ 272.6
Average common shares outstanding - Basic	215.0	214.3	213.6
Average common shares outstanding - Diluted	215.5	215.0	215.1
Earnings per share from continuing operations - Basic	$ 0.92	$ 1.14	$ 1.17
Earnings per share from continuing operations - Diluted	$ 0.92	$ 1.14	$ 1.17
Earnings per share from discontinued operations attributable to TECO Energy - Basic	$ 0.00	$ (0.15)	$ 0.10
Earnings per share from discontinued operations attributable to TECO Energy - Diluted	$ 0.00	$ (0.15)	$ 0.10
Earnings per share attributable to TECO Energy - Basic	$ 0.92	$ 0.99	$ 1.27
Earnings per share attributable to TECO Energy - Diluted	$ 0.92	$ 0.99	$ 1.27
Dividends paid per common share outstanding	$ 0.88	$ 0.88	$ 0.85