Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2021

Fair Value Disclosures [Abstract]

Fair value hierarchy for financial assets and liabilities

The following tables present the Company’s fair value hierarchy for financial assets and liabilities measured as of June 30, 2021 and December 31, 2020 ($ in millions):

	June 30, 2021
	Level 1		Level 2		Level 3		Total
Assets:
U.S. Government obligations	$	—	$	71.2	$	—	$	71.2
Total	$	—	$	71.2	$	—	$	71.2

	December 31, 2020
	Level 1		Level 2		Level 3		Total
Assets:
U.S. Government obligations	$	—	$	6.6	$	—	$	6.6
Total	$	—	$	6.6	$	—	$	6.6