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Commitments and Contingencies (Tables)
 9 Months Ended
Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]  
Personal Injury Liability Activity
The personal injury liability activity was as follows (in millions):
 
Nine Months Ended September 30,
 
2017
 
2016
Balance at beginning of year
$
23.8

 
$
23.9

Accruals
3.6

 
3.6

Change in estimate
(2.0
)
 
(0.6
)
Payments
(4.0
)
 
(2.3
)
Balance at end of period
$
21.4

 
$
24.6