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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 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 March 31, 2021 and December 31, 2020 ($ in millions):
March 31, 2021
Level 1Level 2Level 3Total
Assets:
U.S. Government obligations$— $6.5 $— $6.5 
Total$— $6.5 $— $6.5 
December 31, 2020
Level 1Level 2Level 3Total
Assets:
U.S. Government obligations$— $6.6 $— $6.6 
Total$— $6.6 $— $6.6