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Employee Retirement Plans (Tables)
 6 Months Ended
Jun. 30, 2013
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,
 
2013
 
2012
 
2013
 
2012
 
(in millions)
Expense Components
 
 
 
 
 
 
 
Service cost
$
0.2

 
$
0.2

 
$
0.5

 
$
0.4

Interest
4.6

 
4.9

 
9.3

 
9.7

Expected return on plan assets
(6.7
)
 
(5.8
)
 
(13.3
)
 
(11.4
)
Amortization of actuarial loss
1.3

 
0.9

 
2.5

 
1.8

Defined benefit expense
(0.6
)
 
0.2

 
(1.0
)
 
0.5

Profit sharing
3.3

 
3.2

 
6.4

 
5.8

Net expense
$
2.7

 
$
3.4

 
$
5.4

 
$
6.3