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Fair Value Measurements (Details)
$ in Millions
9 Months Ended
Sep. 30, 2021
USD ($)
contract
Dec. 31, 2020
USD ($)
Cash Flow Hedging    
Fair value of assets and liabilities measured on recurring basis    
Number of forward contracts | contract 2  
Maximum | Cash Flow Hedging    
Fair value of assets and liabilities measured on recurring basis    
Hedge expiration period 1 year  
Fair value measurements recurring basis    
Fair value of assets and liabilities measured on recurring basis    
Short-term investments $ 34.4 $ 36.1
Forward contracts (5.4) (2.7)
Total asset 29.0 33.4
Fair value measurements recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair value of assets and liabilities measured on recurring basis    
Short-term investments 34.4 36.1
Forward contracts 0.0 0.0
Total asset 34.4 36.1
Fair value measurements recurring basis | Significant Observable Inputs (Level 2)    
Fair value of assets and liabilities measured on recurring basis    
Short-term investments 0.0 0.0
Forward contracts (5.4) (2.7)
Total liability (5.4) (2.7)
Fair value measurements recurring basis | Significant Unobservable Inputs (Level 3)    
Fair value of assets and liabilities measured on recurring basis    
Short-term investments 0.0 0.0
Forward contracts 0.0 0.0
Total asset $ 0.0 $ 0.0