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Other Operating Credits and Charges, Net (Tables)
 9 Months Ended
Sep. 30, 2018
Schedule of Other Operating Cost and Expense, by Component [Table Text Block]
 
Quarter Ended
 
Nine Months Ended
 
September 30,
 
September 30,
Dollar amounts in millions
2018
 
2017
 
2018
 
2017
Reorganization charges
$
(0.9
)
 
$
—

 
$
(4.7
)
 
$
—

Adjustment to product-related warranty reserves
7.7

 
—

 
7.7

 
(5.4
)
Refund of environmental costs
—

 
—

 
8.3

 
—

Refund of sales and use taxes
—

 
0.9

 
—

 
0.9

Expenses related to hurricane
(0.5
)
 
—

 
(0.5
)
 
—

Other
—

 
—

 
0.4

 
—

 
$
6.3

 
$
0.9

 
$
11.2

 
$
(4.5
)