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Employee Retirement Plans (Tables)
 6 Months Ended
Jun. 30, 2015
Compensation and Retirement Disclosure [Abstract]  
Components of net retirement cost
The following table summarizes the components of net retirement cost for the Company:
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2015
 
2014
 
2015
 
2014
 
(in millions)
Expense Components
 
 
 
 
 
 
 
Defined benefit:
 
 
 
 
 
 
 
Service cost
$
0.1

 
$
0.1

 
$
0.2

 
$
0.2

Interest
5.0

 
5.0

 
10.0

 
10.0

Expected return on plan assets
(7.6
)
 
(7.7
)
 
(15.2
)
 
(15.4
)
Amortization of actuarial loss
1.3

 
0.3

 
2.6

 
0.6


(1.2
)
 
(2.3
)
 
(2.4
)
 
(4.6
)
Profit sharing
5.1

 
5.2

 
10.4

 
8.9

Multiemployer plan
0.5

 
—

 
1.1

 
—

Net retirement cost
$
4.4

 
$
2.9

 
$
9.1

 
$
4.3