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OTHER ASSETS (Tables)
 6 Months Ended
Jun. 30, 2021
Other Assets [Abstract]  
Schedule of Other Assets
Included in other assets were the following:
June 30, 2021December 31, 2020June 30, 2020
($ in millions)
Supply contracts$1,091.0 $1,122.9 $1,137.9 
Other74.9 68.4 41.8 
Other assets
$1,165.9 $1,191.3 $1,179.7