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Business Combinations (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2016
USD ($)
acquisition
Sep. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
acquisition
Business Acquisition [Line Items]        
Number of Businesses Acquired | acquisition 22      
Payments to Acquire Businesses, Net of Cash Acquired $ 418.6 $ 102.9    
Business Combinations, Guaranteed Deferred Acquisition Obligation 53.1 14.2    
Business Combination, contingent earn-out consideration 90.5 $ 36.9    
Goodwill, Acquired During Period 440.4      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles 96.0      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net 25.8      
Deferred acquisition obligations paid 46.6      
Payments for Repurchase of Redeemable Noncontrolling Interest 2.8      
Goodwill, Period Increase (Decrease) 10.2      
Business Combination, identifiable intangible increase (decrease) 4.5      
Business combination, other net assets acquired increase(decrease) 5.7      
Maximum amount of the potential earn-out payments $ 417.0     $ 230.4
Number of acquisitions subject to potential earn-out payments provisions | acquisition 47     28
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests $ 3.6      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]        
Business Acquisition [Line Items]        
Business Combination, Contingent Consideration, Liability $ 210.1   $ 169.6 $ 127.3