Employee Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2014

Compensation And Retirement Disclosure [Abstract]

Schedule of Net Periodic Benefit Cost

Included in the table below is the periodic expense for pension and other postretirement benefits offered by the company.

Pension Expense
(millions)	Pension Benefits						Other Postretirement Benefits
Three months ended Sep 30,	2014			2013			2014			2013
Components of net periodic benefit expense
Service cost	$	4.6		$	4.5		$	0.6		$	0.7
Interest cost on projected benefit obligations		8.0			7.3			2.7			2.3
Expected return on assets		(10.5	)		(9.6	)		(0.1	)		0.0
Amortization of:
Prior service (benefit) cost		(0.1	)		(0.1	)		0.0			(0.1	)
Actuarial loss		3.3			5.1			0.0			0.2
Regulatory asset		0.0			0.0			0.1			0.0
Settlement cost		0.0			1.0			0.0			0.0
Net pension expense recognized in the    TECO Energy Consolidated Condensed Statements of Income	$	5.3		$	8.2		$	3.3		$	3.1
Nine months ended Sep 30,
Components of net periodic benefit expense
Service cost	$	12.9		$	13.6		$	1.8		$	1.9
Interest cost on projected benefit obligations		24.4			21.7			7.9			7.0
Expected return on assets		(31.2	)		(28.8	)		(0.1	)		0.0
Amortization of:
Prior service (benefit) cost		(0.3	)		(0.3	)		(0.1	)		(0.3	)
Actuarial loss		10.0			15.4			0.1			0.7
Regulatory asset		0.0			0.0			0.1			0.0
Settlement cost		0.0			1.0			0.0			0.0
Net pension expense recognized in the    TECO Energy Consolidated Condensed Statements of Income	$	15.8		$	22.6		$	9.7		$	9.3