Quarterly report pursuant to Section 13 or 15(d)

Assets and Liabilities Measured at Fair Value - Realized and Unrealized Gains (Losses) (Details)

v3.21.1
Assets and Liabilities Measured at Fair Value - Realized and Unrealized Gains (Losses) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Realized and unrealized gains (losses) on financial instruments $ (65.0) $ 2.0  
Fair Value, option, credit Risk, gains (losses) on assets 4.0    
Debt Issuance Costs, Net 14.0   $ 9.0
TripCo Exchangeable Senior Debentures due 2051      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair Value, option, credit Risk, gains (losses) on assets 4.0    
Debt Issuance Costs, Net 5.0    
TripCo Exchangeable Senior Debentures due 2051      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Realized and unrealized gains (losses) on financial instruments (10.0)    
Financial instrument liabilities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Realized and unrealized gains (losses) on financial instruments $ (55.0) 1.0  
Tripadvisor Foreign Currency Forward Contracts      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Realized and unrealized gains (losses) on financial instruments   $ 1.0