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Employee Benefits
 3 Months Ended
Mar. 31, 2019
Retirement Benefits [Abstract]  
Employee Benefits  Employee Benefits

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

Components of net periodic benefit cost for both the Retirement Plans and PBOP for the three months ended March 31, 2019 and 2018, were as follows (in millions):
 
Retirement Plans
 
PBOP
 
For the
Three Months Ended
March 31,
 
For the
Three Months Ended
March 31,
 
2019
 
2018
 
2019
 
2018
Service cost
$
0.8

 
$
0.9

 
$
—

 
$
—

Interest cost
1.1

 
1.1

 
0.3

 
0.4

Expected return on plan assets
(1.6
)
 
(2.0
)
 
(0.8
)
 
(1.1
)
Amortization of unrecognized net loss
0.6

 
0.4

 
—

 
—

Settlement charge
0.4

 
0.6

 
—

 
—

Net periodic benefit cost
$
1.3

 
$
1.0

 
$
(0.5
)
 
$
(0.7
)

The components of net periodic benefit cost, other than the service cost component, are included in Miscellaneous other income, net and the service cost component is included in Administrative and general on the Condensed Consolidated Statements of Income.    

Through the date of this filing, the Partnership has made no contributions to the defined benefit pension plan in 2019, but expects to fund $3.0 million in 2019.
 
Defined Contribution Plans

Texas Gas Transmission, LLC employees hired on or after November 1, 2006, and all other employees of the Partnership 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 $2.8 million and $2.9 million for the three months ended March 31, 2019 and 2018.