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Fair Value (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total cash equivalents $ 293.5 $ 31.8
Short-term investments 32.4 18.4 [1]
Prepaid expenses and other current assets 53.5 27.1 [1]
Corporate debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total cash equivalents 151.5 15.7
Money market mutual funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total cash equivalents 142.0 16.1
Level 1 | Measured on a recurring basis | Forward-starting interest rate swap contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Prepaid expenses and other current assets   0.0
Deferred costs and other assets, net of current portion   0.0
Level 1 | Measured on a recurring basis | Interest rate cap contract    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Prepaid expenses and other current assets 0.0  
Deferred costs and other assets, net of current portion 0.0 0.0
Derivative liability   0.0
Level 1 | Measured on a recurring basis | Interest rate swap contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Prepaid expenses and other current assets 0.0  
Deferred costs and other assets, net of current portion 0.0  
Derivative liability   0.0
Level 1 | Measured on a recurring basis | Corporate debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total cash equivalents 0.0 0.0
Short-term investments 0.0 0.0
Level 1 | Measured on a recurring basis | Money market mutual funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total cash equivalents 142.0 16.1
Level 1 | Measured on a recurring basis | Securities guaranteed by U.S. government    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 0.0  
Level 1 | Measured on a recurring basis | Other governmental securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 0.0  
Level 1 | Measured on a non-recurring basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired lease-related assets   0.0
Level 2 | Measured on a recurring basis | Forward-starting interest rate swap contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Prepaid expenses and other current assets   0.7
Deferred costs and other assets, net of current portion   15.2
Level 2 | Measured on a recurring basis | Interest rate cap contract    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Prepaid expenses and other current assets 0.8  
Deferred costs and other assets, net of current portion 0.6 0.1
Derivative liability   (0.4)
Level 2 | Measured on a recurring basis | Interest rate swap contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Prepaid expenses and other current assets 19.2  
Deferred costs and other assets, net of current portion 37.2  
Derivative liability   (2.4)
Level 2 | Measured on a recurring basis | Corporate debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total cash equivalents 151.5 15.7
Short-term investments 25.7 18.4
Level 2 | Measured on a recurring basis | Money market mutual funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total cash equivalents 0.0 0.0
Level 2 | Measured on a recurring basis | Securities guaranteed by U.S. government    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 5.0  
Level 2 | Measured on a recurring basis | Other governmental securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 1.7  
Level 2 | Measured on a non-recurring basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired lease-related assets   0.0
Level 3 | Measured on a recurring basis | Forward-starting interest rate swap contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Prepaid expenses and other current assets   0.0
Deferred costs and other assets, net of current portion   0.0
Level 3 | Measured on a recurring basis | Interest rate cap contract    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Prepaid expenses and other current assets 0.0  
Deferred costs and other assets, net of current portion 0.0 0.0
Derivative liability   0.0
Level 3 | Measured on a recurring basis | Interest rate swap contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Prepaid expenses and other current assets 0.0  
Deferred costs and other assets, net of current portion 0.0  
Derivative liability   0.0
Level 3 | Measured on a recurring basis | Corporate debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total cash equivalents 0.0 0.0
Short-term investments 0.0 0.0
Level 3 | Measured on a recurring basis | Money market mutual funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total cash equivalents 0.0 0.0
Level 3 | Measured on a recurring basis | Securities guaranteed by U.S. government    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 0.0  
Level 3 | Measured on a recurring basis | Other governmental securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 0.0  
Level 3 | Measured on a non-recurring basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired lease-related assets   $ 14.2
Secured Debt | First Lien Term Loan | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt instrument fair value 591.0  
Senior Notes | Senior Notes | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt instrument fair value $ 526.5  
[1] The Condensed Consolidated Balance Sheet as of December 31, 2021 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.