Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2013

Accounting Policies [Abstract]

Estimated Useful Lives of Depreciable Property

Other TECO Energy subsidiaries compute depreciation primarily by the straight-line method at annual rates that amortize the original cost, less net salvage value, of depreciable property over the following estimated useful lives:

Asset	Estimated Useful Lives
Building and improvements	5 - 40 years
Office equipment and furniture	3 - 30 years
Vehicles, mining and other equipment	2 - 15 years
Coal processing facilities	7 - 20 years
Computer software	2 - 15 years

Schedule of Fuel Inventory

Fuel Inventory (millions)	Dec. 31, 2013		Dec. 31, 2012
TEC	$	93.7	$	89.1
TECO Coal		25.0		34.5
Total	$	118.7	$	123.6