XML 51 R30.htm IDEA: XBRL DOCUMENT v3.23.2
Fair Value Measurements - Summary (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]    
Cash equivalents $ 952.1 $ 420.7
Debt securities, available-for-sale 2,441.3 1,813.9
Other assets 14.4 10.2
Total assets measured at fair value on a recurring basis 3,407.8 2,244.8
U.S. government agencies    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]    
Debt securities, available-for-sale 1,640.5 1,530.7
Commercial paper    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]    
Debt securities, available-for-sale 419.7 119.4
Corporate debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]    
Debt securities, available-for-sale 381.1 163.8
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]    
Cash equivalents 911.4 375.9
Debt securities, available-for-sale 0.0 0.0
Other assets 14.4 10.2
Total assets measured at fair value on a recurring basis 925.8 386.1
Level 1 | U.S. government agencies    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]    
Debt securities, available-for-sale 0.0 0.0
Level 1 | Commercial paper    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]    
Debt securities, available-for-sale 0.0 0.0
Level 1 | Corporate debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]    
Debt securities, available-for-sale 0.0 0.0
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]    
Cash equivalents 40.7 44.8
Debt securities, available-for-sale 2,441.3 1,813.9
Other assets 0.0 0.0
Total assets measured at fair value on a recurring basis 2,482.0 1,858.7
Level 2 | U.S. government agencies    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]    
Debt securities, available-for-sale 1,640.5 1,530.7
Level 2 | Commercial paper    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]    
Debt securities, available-for-sale 419.7 119.4
Level 2 | Corporate debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]    
Debt securities, available-for-sale 381.1 163.8
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]    
Cash equivalents 0.0 0.0
Debt securities, available-for-sale 0.0 0.0
Other assets 0.0 0.0
Total assets measured at fair value on a recurring basis 0.0 0.0
Level 3 | U.S. government agencies    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]    
Debt securities, available-for-sale 0.0 0.0
Level 3 | Commercial paper    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]    
Debt securities, available-for-sale 0.0 0.0
Level 3 | Corporate debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]    
Debt securities, available-for-sale $ 0.0 $ 0.0