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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 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 and six months ended June 30, 2015 and 2014:
 
 
Three Months Ended 
 June 30,
 
Six Months Ended
June 30,
 
 
2015
 
2014
 
2015
 
2014
Components of net periodic pension benefit cost:
 
 

 
 

 
 
 
 
Service cost
 
$
0.7

 
$
0.6

 
$
1.4

 
$
1.2

Interest cost
 
1.2

 
1.3

 
2.4

 
2.6

Expected return on plan assets
 
(1.7
)
 
(1.7
)
 
(3.4
)
 
(3.3
)
Amortization of actuarial gains
 
0.3

 
0.1

 
0.6

 
0.3

Curtailment
 
—

 
0.1

 
—

 
0.2

Amortization of prior service costs
 
(0.1
)
 
—

 
(0.1
)
 
(0.1
)
Net periodic cost
 
$
0.4

 
$
0.4

 
$
0.9

 
$
0.9