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Employee Retirement Plans (Tables)
 9 Months Ended
Sep. 30, 2012
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,
 
 
2012
 
2011
 
2012
 
2011
 
 
(in millions)
Service cost
 
$
0.2

 
$
0.2

 
$
0.6

 
$
0.7

Interest
 
4.9

 
4.9

 
14.6

 
14.7

Expected return on plan assets
 
(5.7
)
 
(5.7
)
 
(17.1
)
 
(17.1
)
Actuarial loss
 
0.7

 
0.4

 
2.5

 
1.4

Prior service cost
 
0.1

 
0.1

 
0.1

 
0.1

Defined benefit expense
 
0.2

 
(0.1
)
 
0.7

 
(0.2
)
Profit sharing
 
3.1

 
1.9

 
8.9

 
6.4

Net expense
 
$
3.3

 
$
1.8

 
$
9.6

 
$
6.2