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Fair Value (Tables)
9 Months Ended
Sep. 30, 2020
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, 2020Level 1Level 2Level 3
Measured on a recurring basis:
Corporate debt securities$17.6 $— $— 
Money market mutual funds$82.4 $— $— 
Derivative contract, net$— $(12.4)$— 
Measured on a non-recurring basis:
N/A$— $— $— 
Fair Value at December 31, 2019Level 1Level 2Level 3
Measured on a recurring basis:
Corporate debt securities$— $— $— 
Money market mutual funds$— $— $— 
Derivative contract, net$— $(6.0)$— 
Measured on a non-recurring basis:
Impaired right-of-use assets$— $— $1.4