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Fair Value of Financial Instruments (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Narrative) (Details) - Earn-Out Arrangements [Member] - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]            
Additions from new business combinations, ASC 805 contingent consideration $ 0   $ 0 $ 0 $ 0  
Payments of ASC 805 contingent consideration 10,600,000   32,200,000 10,600,000 32,200,000  
Foreign Currency Translation Adjustments [Member]            
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]            
Foreign currency translation (losses) gains, included in other comprehensive income, ASC 805 contingent consideration     (1,000,000) (600,000) $ 3,600,000  
Other Income [Member]            
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]            
Reduction in ASC 805 contingent consideration, gain included in earnings   $ 2,300,000 $ 3,600,000      
Level 3 [Member] | Fair Value [Member]            
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]            
ASC 805 contingent consideration, fair value $ 46,200,000     $ 46,200,000   $ 58,400,000
Level 3 [Member] | Fair Value Measurements, Recurring [Member]            
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]            
Fair value measurements, valuation techniques       The fair value of ASC 805 contingent consideration is based on management estimates and entity-specific assumptions, which are Level 3 inputs, and is evaluated on an ongoing basis.