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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]  
Combined Amount of Net Periodic Benefit Cost Recognizedd
The following table sets forth the combined amount of net periodic benefit cost recognized for the three months ended March 31, 2015 and 2014:
 
 
Three Months Ended 
 March 31,
 
 
2015
 
2014
Components of net periodic pension benefit cost:
 
 

 
 

Service cost
 
$
0.7

 
$
0.6

Interest cost
 
1.2

 
1.3

Expected return on plan assets
 
(1.7
)
 
(1.6
)
Amortization of actuarial gains
 
0.3

 
0.2

Curtailment
 
—

 
0.1

Amortization of prior service costs
 
—

 
(0.1
)
Net periodic cost
 
$
0.5

 
$
0.5