XML 33 R22.htm IDEA: XBRL DOCUMENT v2.4.0.6
Commitments and Contingencies (Tables)
 6 Months Ended
Jun. 30, 2012
Commitments and Contingencies Disclosure [Abstract]  
Personal Injury Liability Activity
The personal injury liability activity was as follows (in millions):
 
Six Months Ended June 30,
 
2012
 
2011
Balance at beginning of year
$
40.1

 
$
62.2

Accruals
5.0

 
5.4

Change in estimate
(3.6
)
 
(9.2
)
Payments
(2.5
)
 
(9.7
)
Balance at end of period
$
39.0

 
$
48.7