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Employee Benefits
 6 Months Ended
Jun. 30, 2013
Compensation and Retirement Disclosure [Abstract]  
Employee Benefits

Note 10:  Employee Benefits

Defined Benefit Retirement Plans and Postretirement Benefits Other Than Pension (PBOP)

Texas Gas Transmission, LLC (Texas Gas) employees hired prior to November 1, 2006, are covered under a non-contributory, defined benefit pension plan (Pension Plan). The Texas Gas Supplemental Retirement Plan (SRP) provides pension benefits for the portion of an eligible employee’s pension benefit under the Pension Plan that becomes subject to compensation limitations under the Internal Revenue Code. Collectively, the Partnership refers to the Pension Plan and the SRP as Retirement Plans. Texas Gas provides postretirement medical benefits and life insurance to retired employees who were employed full time, hired prior to January 1, 1996, and have met certain other requirements.

Components of net periodic benefit cost for both the Retirement Plans and PBOP for the three months ended June 30, 2013 and 2012 were as follows (in millions):
 
Retirement Plans
 
PBOP
 
For the
Three Months Ended
June 30,
 
For the
Three Months Ended
June 30,
 
2013
 
2012
 
2013
 
2012
Service cost
$
1.1

 
$
1.0

 
$
0.1

 
$
0.1

Interest cost
1.2

 
1.5

 
0.4

 
0.6

Expected return on plan assets
(2.3
)
 
(2.2
)
 
(1.1
)
 
(1.0
)
Amortization of prior service credit
—

 
—

 
(1.9
)
 
(2.0
)
Amortization of unrecognized net loss
0.6

 
0.5

 
(0.1
)
 
—

Net periodic benefit cost
$
0.6

 
$
0.8

 
$
(2.6
)
 
$
(2.3
)


Components of net periodic benefit cost for both the Retirement Plans and PBOP for the six months ended June 30, 2013 and 2012 were as follows (in millions):
 
Retirement Plans
 
PBOP
 
For the
Six Months Ended
June 30,
 
For the
Six Months Ended
June 30,
 
2013
 
2012
 
2013
 
2012
Service cost
$
2.2

 
$
2.0

 
$
0.2

 
$
0.2

Interest cost
2.4

 
2.9

 
0.9

 
1.2

Expected return on plan assets
(4.5
)
 
(4.3
)
 
(2.2
)
 
(2.1
)
Amortization of prior service credit
—

 
—

 
(3.8
)
 
(3.9
)
Amortization of unrecognized net loss
1.2

 
1.0

 
—

 
0.1

Net periodic benefit cost
$
1.3

 
$
1.6

 
$
(4.9
)
 
$
(4.5
)

Through the date of this filing, the Partnership has not contributed to the Pension Plan, but expects to fund $3.0 million to the Pension Plan in 2013.
 
Defined Contribution Plans

The Partnership’s employees not covered under the Pension Plan are provided retirement benefits under a defined contribution money purchase plan. The Partnership also provides 401(k) plan benefits to its employees. Costs related to the Partnership’s defined contribution plans were $2.2 million and $2.0 million for the three months ended June 30, 2013 and 2012, and were $4.4 million and $4.1 million for the six months ended June 30, 2013 and 2012.