Commitment and Contingent Liabilities (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2021

Dec. 31, 2020

Commitment and Contingent Liabilities

Aggregate minimum rental commitments under non-cancelable leases

Aggregate minimum rental commitments under non-cancelable leases at September 30, 2021 are as follows ($ in millions):

2021 (remaining three months)	$	1.3
2022		5.0
2023		2.8
2024		2.8
2025 and thereafter		4.2
	$	16.1

Aggregate minimum rental commitments under non-cancelable operating leases at December 31, 2020 are as follows ($ in millions):

2021	$	4.8
2022		5.0
2023		2.8
2024		2.8
2025 and thereafter		4.4
	$	19.8