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Investments (Tables)
9 Months Ended
Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]  
Schedule of Investments The following table provides amortized costs, gross unrealized gains and losses, fair values and the level in the fair value hierarchy for the Company’s investments:
(in millions)Amortized CostGross Unrealized GainsFair ValueLevel 1
Level 2 (1)
September 30, 2021
Certificates of deposit0.5 — 0.5 — 0.5 
Total short-term investments$0.5 $— $0.5 $— $0.5 
December 31, 2020
U.S. government and agency bonds$35.1 $0.2 $35.3 $35.3 $— 
Corporate bonds2.8 0.1 2.9 — 2.9 
Certificates of deposit2.2 — 2.2 — 2.2 
Total short-term investments$40.1 $0.3 $40.4 $35.3 $5.1 
(1) Fair value was determined using market prices obtained from third-party pricing sources.