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Fair Value Measurements - Assets and Liabilities Measured on Recurring Basis (Details) - Recurring Basis - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Assets:    
Assets $ 27.9 $ 91.9
Certificate of deposit    
Assets:    
Certificate of deposit 2.2 2.1
Money Market Funds    
Assets:    
Cash and cash equivalents—money market funds 25.7 89.8
Quoted Prices in Active Markets (Level 1)    
Assets:    
Assets 25.7 89.8
Quoted Prices in Active Markets (Level 1) | Certificate of deposit    
Assets:    
Certificate of deposit 0.0 0.0
Quoted Prices in Active Markets (Level 1) | Money Market Funds    
Assets:    
Cash and cash equivalents—money market funds 25.7 89.8
Other Observable Inputs (Level 2)    
Assets:    
Assets 2.2 2.1
Other Observable Inputs (Level 2) | Certificate of deposit    
Assets:    
Certificate of deposit 2.2 2.1
Other Observable Inputs (Level 2) | Money Market Funds    
Assets:    
Cash and cash equivalents—money market funds 0.0 0.0
Significant Unobservable Inputs (Level 3)    
Assets:    
Assets 0.0 0.0
Significant Unobservable Inputs (Level 3) | Certificate of deposit    
Assets:    
Certificate of deposit 0.0 0.0
Significant Unobservable Inputs (Level 3) | Money Market Funds    
Assets:    
Cash and cash equivalents—money market funds $ 0.0 $ 0.0