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Investments
 6 Months Ended
Jun. 30, 2021
Investments, Debt and Equity Securities [Abstract]  
Investments Investments
The Company’s investments in debt securities had maturity dates that range from one month to six months at June 30, 2021. Realized gains or losses for both the three and six months ended June 30, 2021 and 2020 were insignificant. 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)
June 30, 2021
U.S. government and agency bonds$15.0 $— $15.0 $15.0 $— 
Corporate bonds2.0 — 2.0 — 2.0 
Certificates of deposit0.5 — 0.5 — 0.5 
Total short-term investments$17.5 $— $17.5 $15.0 $2.5 
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.