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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 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 months ended March 31, 2014 and 2013:
 
 
Three Months Ended
 
 
March 31,
 
 
2014
 
2013
Components of net periodic pension benefit cost:
 
 
 
 
Service cost
 
$
0.6

 
$
0.6

Interest cost
 
1.3

 
1.2

Expected return on plan assets
 
(1.6
)
 
(1.4
)
Amortization of actuarial gains
 
0.2

 
0.2

Curtailments
 
0.1

 
—

Amortization of prior service costs
 
(0.1
)
 
—

Net periodic cost
 
$
0.5

 
$
0.6