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Employee Benefit Plans
 3 Months Ended
Mar. 31, 2015
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
Employee Benefit Plans
Defined Benefit Pension and Other Postretirement Benefit (OPEB) Plans

We sponsor several defined benefit pension and OPEB plans for our employees, including non-qualified pension plans. We maintain a separate defined benefit plan for eligible employees in our U.K. operation (the U.K. plan). The U.S. defined benefit pension plans were closed to new entrants and amended to freeze participation and benefit accruals for existing participants effective December 31, 2013. The U.K. plan was closed to new entrants effective December 31, 2002 and was amended to freeze participation for existing participants effective June 30, 2014.

The following table provides the components of the net periodic benefit cost (credit) for the defined benefit pension and OPEB plans.
 
Three Months Ended March 31
 
Pension Benefits
 
 
 
 
 
U.S. Plans
 
U.K. Plan
 
OPEB
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
 
(in millions of dollars)
Service Cost
$
1.0

 
$
0.9

 
$
—

 
$
1.1

 
$
—

 
$
0.1

Interest Cost
20.5

 
22.5

 
2.0

 
2.3

 
1.8

 
2.0

Expected Return on Plan Assets
(27.2
)
 
(29.5
)
 
(3.1
)
 
(3.4
)
 
(0.2
)
 
(0.2
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
   Net Actuarial Loss
2.9

 
1.3

 
0.1

 
0.1

 
—

 
—

   Prior Service Credit
—

 
—

 
—

 
—

 
—

 
(0.4
)
Total
$
(2.8
)
 
$
(4.8
)
 
$
(1.0
)
 
$
0.1

 
$
1.6

 
$
1.5