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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2014
Compensation and Retirement Disclosure [Abstract]  
Combined amount of net periodic benefit cost recognized
The following table sets forth the combined amount of net periodic benefit cost recognized for the three and six months ended June 30, 2014 and 2013:
 
 
Three Months Ended
 
Six Months Ended
 
 
June 30,
 
June 30,
 
 
2014
 
2013
 
2014
 
2013
Components of net periodic pension benefit cost:
 
 

 
 

 
 
 
 
Service cost
 
$
0.6

 
$
0.6

 
$
1.2

 
$
1.2

Interest cost
 
1.3

 
1.2

 
2.6

 
2.4

Expected return on plan assets
 
(1.7
)
 
(1.4
)
 
(3.3
)
 
(2.8
)
Amortization of actuarial gains
 
0.1

 
0.3

 
0.3

 
0.5

Curtailment
 
0.1

 
—

 
0.2

 
—

Amortization of prior service costs
 
—

 
(0.1
)
 
(0.1
)
 
(0.1
)
Net periodic cost
 
$
0.4

 
$
0.6

 
$
0.9

 
$
1.2