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Fair Value (Tables)
 9 Months Ended
Sep. 30, 2022
Fair Value Disclosures [Abstract]  
Assets and (Liabilities) Measured at Fair Value
The fair value (in millions) of our financial assets and (liabilities) was determined using the following inputs:
Fair Value at September 30, 2022Level 1Level 2Level 3
Measured on a recurring basis:
Assets:
Cash equivalents:
Corporate debt securities$— $151.5 $— 
Money market mutual funds$142.0 $— $— 
Short-term investments:
Corporate debt securities$— $25.7 $— 
Securities guaranteed by U.S. government$— $5.0 $— 
Other governmental securities$— $1.7 $— 
Prepaid expenses and other current assets:
Interest rate cap contract$— $0.8 $— 
Interest rate swap contracts$— $19.2 $— 
Deferred costs and other assets, net of current portion
Interest rate cap contract$— $0.6 $— 
Interest rate swap contracts$— $37.2 $— 
Fair Value at December 31, 2021Level 1Level 2Level 3
Measured on a recurring basis:
Assets:
Cash equivalents:
Corporate debt securities$— $15.7 $— 
Money market mutual funds$16.1 $— $— 
Short-term investments:
Corporate debt securities$— $18.4 $— 
Prepaid expenses and other current assets:
Forward-starting interest rate swap contracts$— $0.7 $— 
Deferred costs and other assets, net of current portion
Interest rate cap contract$— $0.1 $— 
Forward-starting interest rate swap contracts$— $15.2 $— 
Liabilities:
Derivative contracts:
Interest rate cap contract$— $(0.4)$— 
Interest rate swap contracts$— $(2.4)$— 
Measured on a non-recurring basis:
Impaired lease-related assets$— $— $14.2