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Investments (Tables)
 6 Months Ended
Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract]  
Summary of Amortized Cost, Gross Unrealized Gains and Losses, Fair Value and Level in Fair Value Hierarchy for 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 at June 30, 2020 and December 31, 2019:
(in millions)Amortized CostGross Unrealized GainsGross Unrealized LossesFair ValueLevel 1
Level 2 (1)
June 30, 2020
U.S. government and agency bonds$60.1  $0.5  $—  $60.6  $60.6  $—  
Corporate bonds0.8  —  —  0.8  —  0.8  
Certificates of deposit3.9  —  —  3.9  —  3.9  
Commercial Paper—  —  —  —  —  —  
Total short-term investments$64.8  $0.5  $—  $65.3  $60.6  $4.7  
U.S. government and agency bonds$20.7  $0.3  $—  $21.0  $15.4  $5.6  
Corporate bonds2.0  —  —  2.0  —  2.0  
Certificates of deposit0.5  —  —  0.5  —  0.5  
Total long-term investments$23.2  $0.3  $—  $23.5  $15.4  $8.1  
December 31, 2019
U.S. government and agency bonds$94.7  $0.3  $—  $95.0  $85.0  $10.0  
Corporate bonds51.0  0.1  —  51.1  —  51.1  
Certificates of deposit6.3  —  —  6.3  —  6.3  
Commercial Paper10.0  —  —  10.0  —  10.0  
Total short-term investments$162.0  $0.4  $—  $162.4  $85.0  $77.4  
U.S. government and agency bonds$52.9  $0.1  $(0.1) $52.9  $42.9  $10.0  
Corporate bonds2.8  —  —  2.8  —  2.8  
Certificates of deposit2.7  —  —  2.7  —  2.7  
Total long-term investments$58.4  $0.1  $(0.1) $58.4  $42.9  $15.5  
(1) Fair value was determined using market prices obtained from third-party pricing sources.