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Employee Retirement Plans (Tables)
 9 Months Ended
Sep. 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
September 30,
 
Nine Months Ended
September 30,
 
2015
 
2014
 
2015
 
2014
 
(in millions)
Expense Components
 
 
 
 
 
 
 
Defined benefit:
 
 
 
 
 
 
 
Service cost
$
0.1

 
$
0.2

 
$
0.3

 
$
0.4

Interest
5.0

 
5.1

 
15.0

 
15.1

Expected return on plan assets
(7.6
)
 
(7.8
)
 
(22.8
)
 
(23.2
)
Amortization of actuarial loss
1.3

 
1.0

 
3.9

 
1.6


(1.2
)
 
(1.5
)
 
(3.6
)
 
(6.1
)
Profit sharing
4.5

 
3.9

 
14.9

 
12.8

Multiemployer plan
0.6

 
0.3

 
1.7

 
0.3

Net retirement cost
$
3.9

 
$
2.7

 
$
13.0

 
$
7.0