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Cash, Cash Equivalents, and Short-term Investments - Components (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Current assets:      
Cash $ 112.8 $ 276.5  
Cash equivalents      
Total cash equivalents 293.5 31.8  
Cash and cash equivalents 406.3 308.3 [1] $ 196.8
Short-term investments:      
Amortized Cost 32.4 18.4  
Unrealized Gains 0.0 0.0  
Unrealized Losses 0.0 0.0  
Estimated Fair Value 32.4 18.4  
Cash, cash equivalents, and short-term investments, amortized cost 438.7 326.7  
Total cash, cash equivalents, and short-term investments 438.7 326.7  
Corporate debt securities      
Cash equivalents      
Total cash equivalents 151.5 15.7  
Short-term investments:      
Amortized Cost 25.7 18.4  
Estimated Fair Value 25.7 18.4  
Money market mutual funds      
Cash equivalents      
Total cash equivalents 142.0 $ 16.1  
Securities guaranteed by U.S. government      
Short-term investments:      
Amortized Cost 5.0    
Unrealized Gains 0.0    
Unrealized Losses 0.0    
Estimated Fair Value 5.0    
Other governmental securities      
Short-term investments:      
Amortized Cost 1.7    
Unrealized Gains 0.0    
Unrealized Losses 0.0    
Estimated Fair Value $ 1.7    
[1] The Condensed Consolidated Balance Sheet as of December 31, 2021 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.