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Commitment and Contingent Liabilities (Tables)
6 Months Ended
Jun. 30, 2021
Commitments and Contingencies Disclosure [Abstract]  
Aggregate minimum rental commitments under non-cancelable leases
Aggregate minimum rental commitments under non-cancelable leases at June 30, 2021 are as follows ($ in millions):
2021 (remaining six months)$2.6 
20224.9 
20232.8 
20242.8 
2025 and thereafter4.1 
$17.2