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Employee Benefits
 9 Months Ended
Sep. 30, 2016
Compensation and Retirement Disclosure [Abstract]  
EMPLOYEE BENEFITS
EMPLOYEE BENEFITS

The following tables show the components of net periodic pension and OPEB costs for our benefit plans:
 
 
Pension Costs
 
 
Three Months Ended September 30
 
Nine Months Ended September 30
(in millions)
 
2016
 
2015
 
2016
 
2015
Service cost
 
$
2.7

 
$
3.7

 
$
7.9

 
$
11.0

Interest cost
 
12.4

 
13.3

 
37.3

 
39.7

Expected return on plan assets
 
(19.5
)
 
(20.9
)
 
(58.3
)
 
(62.7
)
Amortization of prior service cost
 
0.4

 
0.5

 
1.2

 
1.5

Amortization of net actuarial loss
 
8.1

 
8.8

 
24.3

 
26.7

Net periodic benefit cost
 
$
4.1

 
$
5.4

 
$
12.4

 
$
16.2


 
 
OPEB Costs
 
 
Three Months Ended September 30
 
Nine Months Ended September 30
(in millions)
 
2016
 
2015
 
2016
 
2015
Service cost
 
$
1.9

 
$
2.2

 
$
5.5

 
$
6.7

Interest cost
 
3.3

 
3.4

 
9.9

 
10.1

Expected return on plan assets
 
(3.5
)
 
(4.0
)
 
(10.5
)
 
(12.0
)
Amortization of prior service credit
 
(0.3
)
 
(0.2
)
 
(0.8
)
 
(0.8
)
Amortization of net actuarial loss
 
0.2

 
0.1

 
0.7

 
0.7

Net periodic benefit cost
 
$
1.6

 
$
1.5

 
$
4.8

 
$
4.7



We did not make any contributions to our qualified pension plans during the first nine months of 2016. During the nine months ended September 30, 2016, we made payments of $4.4 million related to our non-qualified pension plans and $2.0 million to our OPEB plans. We expect to make payments of $0.8 million related to our non-qualified pension plans and $2.8 million related to our OPEB plans during the remainder of 2016, dependent upon various factors affecting us, including our liquidity position and possible tax law changes.