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Fair Value Measurements
12 Months Ended
Dec. 31, 2020
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements
The following tables present the Company's fair value hierarchy for financial assets and liabilities measured as of December 31, 2020 and 2019 ($ in millions):
Fair Value Measurements as of December 31, 2020
Level 1 Level 2 Level 3 Total
Assets:       
U.S. Government obligations$— $6.6 $— $6.6 
Total$— $6.6 $— $6.6 
Fair Value Measurements as of December 31, 2019
Level 1Level 2Level 3Total
Assets:    
U.S. Government obligations$— $5.9 $— $5.9 
Total$— $5.9 $— $5.9 
There were no transfers between Level 1, Level 2, or Level 3 during the years ended December 31, 2020 and 2019.