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OTHER ASSETS
3 Months Ended
Mar. 31, 2022
Other Assets [Abstract]  
OTHER ASSETS
NOTE 6. OTHER ASSETS

Included in other assets were the following:
March 31, 2022December 31, 2021March 31, 2021
($ in millions)
Supply contracts$1,044.6 $1,061.8 $1,106.2 
Other71.7 70.0 64.8 
Other assets$1,116.3 $1,131.8 $1,171.0 

Amortization expense of $17.6 million and $17.5 million for the three months ended March 31, 2022 and 2021, respectively, was recognized within cost of goods sold related to our long-term supply contracts and is reflected in depreciation and amortization on the condensed statements of cash flows. The long-term supply contracts are monitored for impairment each reporting period.