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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2023
Fair Value Disclosures [Abstract]  
Investments Measured at Fair Value on Recurring Basis
The following table presents a summary of investments, which were measured at fair value on a recurring basis.
March 31,
2023
December 31,
2022
Fair
Value
LevelingFair
Value
Leveling
(in millions)Level 1Level 2Level 3Level 1Level 2Level 3
Cash and money market funds$103.8 $103.8 $— $— $262.9 $262.9 $— $— 
Restricted cash7.8 7.8 — — 7.8 7.8 — — 
Commercial paper211.2 — 211.2 — 156.0 — 156.0 — 
Corporate debt securities511.4 — 511.4 — 548.4 — 548.4 — 
Securities of government-sponsored entities312.8 — 312.8 — 321.4 — 321.4 — 
Equity security investments135.7 135.7 — — 102.1 102.1 — — 
$1,282.7 $247.3 $1,035.4 $— $1,398.6 $372.8 $1,025.8 $—