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Fair Value of Financial Instruments (Acquisition-Related Contingent Consideration and Other Liabilities) (Narrative) (Details)
3 Months Ended
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]      
Acquisition-related contingent consideration liabilities, range of potential undiscounted earn-out liabilities, low $ 56,000,000    
Acquisition-related contingent consideration liabilities, range of potential undiscounted earn-out liabilities, high 174,000,000    
Acquisition-related contingent consideration liabilities, net increase (decrease), measurement period adjustments $ (200,000)    
Discount Rate [Member] | Minimum [Member]      
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]      
Acquisition-related contingent consideration liabilities, measurement input, discount rate 0.120    
Discount Rate [Member] | Maximum [Member]      
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]      
Acquisition-related contingent consideration liabilities, measurement input, discount rate 0.200    
Discount Rate [Member] | Weighted Average [Member]      
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]      
Acquisition-related contingent consideration liabilities, measurement input, discount rate 0.131    
Earn-Out Liabilities [Member]      
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]      
Acquisition-related contingent consideration liabilities, estimated fair value $ 134,800,000   $ 135,200,000
Acquisition-related contingent consideration liabilities, additions from new business combinations 0 $ 0  
Acquisition-related contingent consideration liabilities, net increase (decrease), measurement period adjustments 0 1,100,000  
Acquisition-related contingent consideration liabilities, net increase (decrease), fair value adjustments, expense (income) (400,000) 1,800,000  
Acquisition-related contingent consideration liabilities, payments 0 $ 0  
Earn-Out Liabilities [Member] | Other Current Liabilities [Member]      
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]      
Acquisition-related contingent consideration liabilities, estimated fair value $ 47,900,000   $ 48,100,000