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Debt Securities - Gross Unrealized Losses and Fair Value Available-For-Sale Investments in Unrealized Loss Position (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Commercial paper    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value $ 52.9  
Less Than 12 Months, Unrealized Loss (0.4)  
12 Months or Longer, Fair Value 0.0  
12 Months or Longer, Unrealized Loss 0.0  
Total, Fair Value 52.9  
Total, Unrealized Loss (0.4)  
Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 251.1 $ 428.6
Less Than 12 Months, Unrealized Loss (4.8) (1.6)
12 Months or Longer, Fair Value 263.7 0.0
12 Months or Longer, Unrealized Loss (4.6) 0.0
Total, Fair Value 514.8 428.6
Total, Unrealized Loss (9.4) (1.6)
Securities of government-sponsored entities    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 235.0 230.5
Less Than 12 Months, Unrealized Loss (6.0) (1.0)
12 Months or Longer, Fair Value 92.9 0.0
12 Months or Longer, Unrealized Loss (3.1) 0.0
Total, Fair Value 327.9 230.5
Total, Unrealized Loss $ (9.1) $ (1.0)