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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]  
Personal Injury Liability Activity
The personal injury liability activity was as follows (in millions):
 
2014
 
2013
Balance at beginning of year
$
31.2

 
$
34.4

Accruals
8.8

 
8.8

Change in estimate
(4.2
)
 
1.3

Payments
(6.5
)
 
(13.3
)
Balance at end of year
$
29.3

 
$
31.2