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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2020
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 September 30, 2020 and December 31, 2019 ($ in millions):
September 30, 2020
Level 1Level 2Level 3Total
Assets:
U.S. Government obligations$— $6.7 $— $6.7 
Total$— $6.7 $— $6.7 
December 31, 2019
Level 1Level 2Level 3Total
Assets:
U.S. Government obligations$— $5.9 $— $5.9 
Total$— $5.9 $— $5.9