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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]  
Aggregate minimum rental commitments under non-cancelable leases
Aggregate minimum rental commitments under non-cancelable operating leases at December 31, 2020 are as follows ($ in millions):
2021$4.8 
20225.0 
20232.8 
20242.8 
2025 and thereafter4.4 
$19.8