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Employee Retirement Plans (Tables)
 3 Months Ended
Mar. 31, 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
March 31,
 
2014
 
2013
 
(in millions)
Expense Components
 
 
 
Service cost
$
0.1

 
$
0.3

Interest
5.0

 
4.7

Expected return on plan assets
(7.7
)
 
(6.6
)
Amortization of actuarial loss
0.3

 
1.2

Defined benefit expense
(2.3
)
 
(0.4
)
Profit sharing
3.7

 
3.1

Net expense
$
1.4

 
$
2.7