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Business Combinations, Goodwill and Other Intangible Assets, Business Combinations Activity (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
acquisition
Dec. 31, 2016
USD ($)
acquisition
Dec. 31, 2015
USD ($)
Business Acquisition [Line Items]      
Number of Businesses Acquired | acquisition 5    
Payments to Acquire Businesses, Gross $ 22.4    
Cash Acquired from Acquisition 5.6    
Business Acquisitions, net of cash acquired 18.7 $ 483.9 $ 391.6
Business Combinations, Guaranteed Deferred Acquisition Obligation 1.8 62.7 23.1
Business Combination, contingent earn-out consideration 11.5    
Goodwill, acquired during period 24.1 529.8  
Finite-lived intangible assets acquired 9.7 104.5  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net 1.9 15.6  
Deferred acquisition obligations paid 50.7 53.9  
Payments for Repurchase of Redeemable Noncontrolling Interest 2.4 2.8  
Goodwill Additions, net of adjustments 29.7 539.8  
Business Acquisition, Goodwill, Expected Tax Deductible Amount 3.5 176.4  
Contingent Consideration Earn-Out, Fair Value 11.5 103.3 105.1
Goodwill, Purchase Accounting Adjustments 5.6    
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 $ 436.2 $ 435.0  
Number of acquisitions subject to potential earn-out payments provisions | acquisition 56 52  
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]      
Business Acquisition [Line Items]      
Business Combination, Contingent Consideration, Liability $ 227.1 $ 229.6 $ 127.3