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Fair Value - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Assets and Liabilities Measured at fair value on a recurring basis    
Restricted cash $ 2.4 $ 0.4
Fair Value, Recurring    
Assets and Liabilities Measured at fair value on a recurring basis    
Restricted cash 2.4 0.4
Short-term investments 20.4 15.9
Foreign currency forward contracts 1.4 4.9
Total assets 473.3 394.4
Foreign currency forward contracts 4.8 10.4
Total liabilities 4.8 10.4
Fair Value, Recurring | Level 1, 2 and 3    
Assets and Liabilities Measured at fair value on a recurring basis    
Cash and cash equivalents 430.1 343.1
Fair Value, Recurring | Level 1    
Assets and Liabilities Measured at fair value on a recurring basis    
Cash and cash equivalents 428.9 341.8
Restricted cash 2.4 0.4
Short-term investments 0.0 0.0
Foreign currency forward contracts 0.0 0.0
Total assets 431.3 342.2
Foreign currency forward contracts 0.0 0.0
Total liabilities 0.0 0.0
Fair Value, Recurring | Level 2    
Assets and Liabilities Measured at fair value on a recurring basis    
Cash and cash equivalents 1.2 1.3
Restricted cash 0.0 0.0
Short-term investments 20.4 15.9
Foreign currency forward contracts 1.4 4.9
Total assets 23.0 22.1
Foreign currency forward contracts 4.8 10.4
Total liabilities 4.8 10.4
Fair Value, Recurring | Level 3    
Assets and Liabilities Measured at fair value on a recurring basis    
Cash and cash equivalents 0.0 0.0
Restricted cash 0.0 0.0
Short-term investments 0.0 0.0
Foreign currency forward contracts 0.0 0.0
Total assets 0.0 0.0
Foreign currency forward contracts 0.0 0.0
Total liabilities 0.0 0.0
Fair Value, Recurring | Fair Value Measured at Net Asset Value Per Share    
Assets and Liabilities Measured at fair value on a recurring basis    
Cash and cash equivalents $ 19.0 $ 30.1