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Employee Retirement Plans (Tables)
 6 Months Ended
Jun. 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
June 30,
 
Six Months Ended
June 30,
 
2014
 
2013
 
2014
 
2013
 
(in millions)
Expense Components
 
 
 
 
 
 
 
Service cost
$
0.1

 
$
0.2

 
$
0.2

 
$
0.5

Interest
5.0

 
4.6

 
10.0

 
9.3

Expected return on plan assets
(7.7
)
 
(6.7
)
 
(15.4
)
 
(13.3
)
Amortization of actuarial loss
0.3

 
1.3

 
0.6

 
2.5

Defined benefit expense
(2.3
)
 
(0.6
)
 
(4.6
)
 
(1.0
)
Profit sharing
5.2

 
3.3

 
8.9

 
6.4

Net expense
$
2.9

 
$
2.7

 
$
4.3

 
$
5.4