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Fair Value (Tables)
3 Months Ended
Mar. 31, 2024
Fair Value Disclosures [Abstract]  
Schedule of Assets and (Liabilities) Measured at Fair Value
The fair value of our financial assets was determined using the following inputs (in millions):
Fair Value at March 31, 2024Level 1Level 2Level 3
Measured on a recurring basis:
Cash equivalents:
Money market mutual funds$252.9 $— $— 
Short-term investments:
Corporate debt securities$— $18.4 $— 
Securities guaranteed by U.S. government— 4.7 — 
Certificates of deposit— 11.2 — 
Prepaid expenses and other current assets:
Interest rate cap contract$— $0.1 $— 
Interest rate swap contracts— 22.5 — 
Deferred costs and other assets, net of current portion:
Interest rate swap contracts$— $14.3 $— 
Total$252.9 $71.2 $— 
Fair Value at December 31, 2023Level 1Level 2Level 3
Measured on a recurring basis:
Cash equivalents:
Money market mutual funds$245.2 $— $— 
Short-term investments:
Corporate debt securities$— $37.4 $— 
Securities guaranteed by U.S. government— 26.7 — 
Other governmental securities— 18.1 — 
Prepaid expenses and other current assets:
Interest rate cap contract$— $0.6 $— 
Interest rate swap contracts— 21.2 — 
Deferred costs and other assets, net of current portion
Interest rate swap contracts$— $15.0 $— 
Measured on a non-recurring basis:
Impaired lease-related assets$— $— $13.6 
Total$245.2 $119.0 $13.6