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Other Assets (Tables)
12 Months Ended
Dec. 31, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Schedule of Other Assets
Other assets consisted of the following ($ in millions):
December 31,
20212020
Capitalized software costs, net of accumulated amortization$13.9 $12.9 
Grantor trust assets21.6 18.0 
Net pension assets26.3 9.3 
Long-term supplies inventory4.9 6.6 
Operating lease assets25.1 19.8 
Other assets9.3 2.6 
Total$101.1 $69.2