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Fair Value Measurements - Assets and Liabilities Measured on Recurring Basis (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Recurring Basis    
Assets:    
Assets $ 66.3 $ 77.4
Liabilities:    
Contingent consideration   30.9
Recurring Basis | Certificate of deposit    
Assets:    
Certificate of deposit 2.1 2.0
Recurring Basis | Quoted Prices in Active Markets (Level 1)    
Assets:    
Assets 64.2 75.4
Liabilities:    
Contingent consideration   0.0
Recurring Basis | Quoted Prices in Active Markets (Level 1) | Certificate of deposit    
Assets:    
Certificate of deposit 0.0 0.0
Recurring Basis | Other Observable Inputs (Level 2)    
Assets:    
Assets 2.1 2.0
Liabilities:    
Contingent consideration   0.0
Recurring Basis | Other Observable Inputs (Level 2) | Certificate of deposit    
Assets:    
Certificate of deposit 2.1 2.0
Recurring Basis | Significant Unobservable Inputs (Level 3)    
Assets:    
Assets 0.0 0.0
Liabilities:    
Contingent consideration   30.9
Recurring Basis | Significant Unobservable Inputs (Level 3) | Certificate of deposit    
Assets:    
Certificate of deposit 0.0 0.0
Money Market Funds    
Assets:    
Cash and cash equivalents—money market funds 64.2 75.4
Money Market Funds | Recurring Basis    
Assets:    
Cash and cash equivalents—money market funds 64.2 75.4
Money Market Funds | Recurring Basis | Quoted Prices in Active Markets (Level 1)    
Assets:    
Cash and cash equivalents—money market funds 64.2 75.4
Money Market Funds | Recurring Basis | Other Observable Inputs (Level 2)    
Assets:    
Cash and cash equivalents—money market funds 0.0 0.0
Money Market Funds | Recurring Basis | Significant Unobservable Inputs (Level 3)    
Assets:    
Cash and cash equivalents—money market funds $ 0.0 $ 0.0