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Leases (Tables)
 12 Months Ended
Dec. 31, 2022
Leases [Abstract]  
Components of Operating Lease Expense
The components of operating lease expense for the years ended December 31 were as follows ($ in millions):
20222021
Fixed operating lease expense (a)
$31.7 $32.4 
Variable operating lease expense7.2 6.1 
Total operating lease expense$38.9 $38.5 
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(a)    Includes short-term leases and sublease income, both of which were not significant.
Schedule of Weighted Average Remaining Lease Term and Discount Rate
The following table presents the weighted average remaining lease term and weighted average discount rates related to the Company’s operating leases as of December 31:
20222021
Weighted average remaining lease term8 years9 years
Weighted average discount rate4.1 %3.5 %
Schedule of Maturity Of Operating Lease Liabilities
The following table presents the maturity of the Company’s operating lease liabilities as of December 31, 2022 ($ in millions):
2023$32.2 
202428.7 
202523.9 
202619.8 
202716.8 
Thereafter50.3 
Total operating lease payments171.7 
Less: imputed interest(23.3)
Total operating lease liabilities$148.4