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Cash, Cash Equivalents, and Marketable Debt Securities - Schedule of Company's Cash and Available-For-Sale (AFS) Debt Securities by Major Asset Category (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Financial Instruments [Line Items]    
Adjusted Cost Basis $ 472.7 $ 765.2
Unrealized Gain 0.0 0.0
Unrealized Loss (2.6) (0.4)
Fair Value 470.1 764.8
Cash and cash equivalents 320.0 618.7
Short-term marketable debt securities 85.2 86.1
Long-term marketable debt securities 64.9 60.0
Level 1    
Financial Instruments [Line Items]    
Adjusted Cost Basis [1] 24.4 27.3
Unrealized Gain [1] 0.0 [2] 0.0
Unrealized Loss [1] (0.4) (0.1)
Fair Value [1] 24.0 27.2
Cash and cash equivalents [1] 0.1 2.9
Short-term marketable debt securities [1] 16.7 14.7
Long-term marketable debt securities [1] 7.2 9.6
Level 2    
Financial Instruments [Line Items]    
Adjusted Cost Basis [2] 130.0 125.6
Unrealized Gain [2]   0.0
Unrealized Loss [2] 2.2 (0.3)
Fair Value [2] 127.8 125.3
Cash and cash equivalents [2] 1.6 3.5
Short-term marketable debt securities [2] 68.5 71.4
Long-term marketable debt securities [2] 57.7 50.4
U.S. Government Agency Securities | Level 2    
Financial Instruments [Line Items]    
Adjusted Cost Basis [2] 4.5 4.8
Unrealized Gain [2] 0.0 0.0
Unrealized Loss [2] (0.1) 0.0
Fair Value [2] 4.4 4.8
Cash and cash equivalents [2] 0.0 0.0
Short-term marketable debt securities [2] 1.2 3.5
Long-term marketable debt securities [2] 3.2 1.3
Corporate Debt Securities | Level 2    
Financial Instruments [Line Items]    
Adjusted Cost Basis [2] 123.9 118.9
Unrealized Gain [2] 0.0 0.0
Unrealized Loss [2] 2.1 (0.3)
Fair Value [2] 121.8 118.6
Cash and cash equivalents [2] 1.6 3.5
Short-term marketable debt securities [2] 65.7 66.0
Long-term marketable debt securities [2] 54.5 49.1
Cash and Cash Equivalents    
Financial Instruments [Line Items]    
Adjusted Cost Basis 318.3 612.3
Unrealized Gain 0.0 0.0
Unrealized Loss 0.0  
Fair Value 318.3 612.3
Cash and cash equivalents 318.3 612.3
Short-term marketable debt securities 0.0 0.0
Long-term marketable debt securities 0.0 0.0
Money Market Fund | Level 1    
Financial Instruments [Line Items]    
Adjusted Cost Basis [1] 0.1 0.9
Unrealized Gain [1] 0.0 0.0
Unrealized Loss [1] 0.0 0.0
Fair Value [1] 0.1 0.9
Cash and cash equivalents [1] 0.1 0.9
Short-term marketable debt securities [1] 0.0 0.0
Long-term marketable debt securities [1] 0.0 0.0
U.S. Treasury Securities | Level 1    
Financial Instruments [Line Items]    
Adjusted Cost Basis [1] 24.3 26.4
Unrealized Gain [1] 0.0 0.0
Unrealized Loss [1] 0.4 (0.1)
Fair Value [1] 23.9 26.3
Cash and cash equivalents [1] 0.0 2.0
Short-term marketable debt securities [1] 16.7 14.7
Long-term marketable debt securities [1] 7.2 9.6
Certificates of Deposit | Level 2    
Financial Instruments [Line Items]    
Adjusted Cost Basis [2] 1.6 1.9
Unrealized Gain [2] 0.0 0.0
Unrealized Loss [2] 0.0  
Fair Value [2] 1.6 1.9
Cash and cash equivalents [2] 0.0 0.0
Short-term marketable debt securities [2] 1.6 1.9
Long-term marketable debt securities [2] $ 0.0 $ 0.0
[1] Valuations based on quoted prices for identical assets and liabilities in active markets.
[2] Valuations based on observable inputs other than quoted prices included in Level 1, such as quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets and liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data.