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Fair Value of Financial Instruments - Acquisition-Related Contingent Consideration and Other Liabilities - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
USD ($)
employee
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
employee
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]          
Measurement period adjustments     $ 0.7    
Fair value recurring basis unobservable input reconciliation liability gain loss statement of income extensible list not disclosed flag   fair value adjustments   fair value adjustments  
All Acquisitions          
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]          
Acquisition-related contingent consideration liabilities, range of potential undiscounted earn-out liabilities, low $ 12.0   12.0    
Acquisition-related contingent consideration liabilities, range of potential undiscounted earn-out liabilities, high $ 101.0   $ 101.0    
Discount Rate | Minimum          
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]          
Acquisition-related contingent consideration liabilities, measurement input, discount rate | employee 0.130   0.130    
Discount Rate | Maximum          
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]          
Acquisition-related contingent consideration liabilities, measurement input, discount rate | employee 0.210   0.210    
Discount Rate | Weighted Average          
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]          
Acquisition-related contingent consideration liabilities, measurement input, discount rate 0.163   0.163    
Earn-Out Liabilities          
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]          
Acquisition-related contingent consideration liabilities, estimated fair value $ 82.2   $ 82.2   $ 77.4
Acquisition-related contingent consideration liabilities, additions from new business combinations 30.3 $ 1.4 30.3 $ 1.4  
Measurement period adjustments 0.0 0.0 0.0 0.0  
Acquisition-related contingent consideration liabilities, net increase (decrease), fair value adjustments 2.3 (4.9) 0.5 (7.0)  
Acquisition-related contingent consideration liabilities, payments 21.4 $ 12.7 26.0 $ 38.8  
Earn-Out Liabilities | Other Current Liabilities          
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]          
Acquisition-related contingent consideration liabilities, estimated fair value $ 22.6   $ 22.6   $ 29.8