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ENVIRONMENTAL (Tables)
 6 Months Ended
Jun. 30, 2019
Environmental Remediation Obligations [Abstract]  
Environmental Provisions Charged (Credited) to Income [Table Text Block] Environmental provisions charged to income, which are included in cost of goods sold, were as follows:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2019
 
2018
 
2019
 
2018
 
($ in millions)
Provisions charged to income
$
22.0

 
$
4.4

 
$
23.8

 
$
6.7

Recoveries for costs incurred and expensed
(4.8
)
 
—

 
(4.8
)
 
—

Environmental expense
$
17.2

 
$
4.4

 
$
19.0

 
$
6.7