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Business Combinations (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2017
USD ($)
acquisition
Sep. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
acquisition
Jun. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Business Acquisition [Line Items]            
Number of Businesses Acquired | acquisition 5          
Payments to Acquire Businesses $ 22.4          
Cash Acquired in Excess of Payments to Acquire Business 5.6          
Business Combinations, Guaranteed Deferred Acquisition Obligation 1.8 $ 53.1        
Business Combination, contingent earn-out consideration 11.5          
Goodwill, Acquired During Period 24.3          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles 9.7          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net 1.7          
Payment for deferred acquisition obligations and earn-out obligation (41.2) (46.6)        
Payments for Repurchase of Redeemable Noncontrolling Interest 2.4          
Goodwill, Period Increase (Decrease) 5.3          
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Assets 1.9          
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles (0.4)          
Maximum amount of the potential earn-out payments $ 436.9     $ 435.0    
Number of acquisitions subject to potential earn-out payments provisions | acquisition 56     52    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]            
Business Acquisition [Line Items]            
Business Combination, Contingent Consideration, Liability $ 223.5 $ 210.1 $ 225.6 $ 229.6 $ 169.6 $ 127.3