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Legal and Environmental Matters Legal and Environmental Matters (Tables)
 9 Months Ended
Sep. 30, 2018
Site Contingency [Line Items]  
Schedule of Environmental Loss Contingencies by Site [Table Text Block]
The activity in our reserve for estimated environmental loss contingency reserves for the quarter and nine months ended September 30, 2018 and 2017 is summarized in the following table.
 
Quarter Ended
 
Nine Months Ended
  
September 30,
 
September 30,
Dollar amounts in millions
2018
 
2017
 
2018
 
2017
Beginning balance
$
12.5

 
$
15.7

 
$
15.0

 
$
15.9

Adjusted to expense
(0.8
)
 
0.8

 
(1.6
)
 
0.9

Payments made
(0.3
)
 
(1.0
)
 
(2.0
)
 
(1.3
)
Ending balance
$
11.4

 
$
15.5

 
$
11.4

 
$
15.5