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Employee Retirement Plans (Tables)
 9 Months Ended
Sep. 30, 2014
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,
 
2014
 
2013
 
2014
 
2013
 
(in millions)
Expense Components
 
 
 
 
 
 
 
Service cost
$
0.2

 
$
0.3

 
$
0.4

 
$
0.8

Interest
5.1

 
4.6

 
15.1

 
13.9

Expected return on plan assets
(7.8
)
 
(6.6
)
 
(23.2
)
 
(19.9
)
Amortization of actuarial loss
1.0

 
1.2

 
1.6

 
3.7

Defined benefit expense
(1.5
)
 
(0.5
)
 
(6.1
)
 
(1.5
)
Profit sharing
3.9

 
3.1

 
12.8

 
9.5

Multiemployer plan
0.3

 
—

 
0.3

 
—

Net expense
$
2.7

 
$
2.6

 
$
7.0

 
$
8.0