OTHER ASSETS (Tables)
 12 Months Ended
Dec. 31, 2019
Other Assets [Abstract]  
Schedule of Other Assets
Included in other assets were the following:
 
December 31,
 
2019
 
2018
 
($ in millions)
Supply contracts
$
1,112.6

 
$
1,099.5

Investments in non-consolidated affiliates
—

 
8.8

Other
56.5

 
42.1

Other assets
$
1,169.1

 
$
1,150.4