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Business Combinations, Goodwill and Other Intangible Assets, Business Combinations Activity (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
acquisition
Dec. 31, 2017
USD ($)
acquisition
Dec. 31, 2016
USD ($)
Business Acquisition [Line Items]      
Servicing Asset at Amortized Cost, Other than Temporary Impairments $ 11.4 $ 10.8  
Number of Businesses Acquired | acquisition 6    
Payments to Acquire Businesses, Gross $ 101.3 22.4  
Cash Acquired from Acquisition   5.6  
Business Combinations, Guaranteed Deferred Acquisition Obligation 3.9 1.8 $ 62.7
Goodwill, acquired during period 60.8 24.1  
Finite-lived intangible assets acquired 57.1 9.7  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net (1.1) 1.9  
Payment for Contingent Consideration Liability, Total 72.3 50.7  
Payments for Repurchase of Redeemable Noncontrolling Interest 1.5 2.4  
Goodwill Additions, net of adjustments 59.0 29.7  
Business Acquisition, Goodwill, Expected Tax Deductible Amount 35.5 3.5  
Goodwill, Purchase Accounting Adjustments   5.6  
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Assets   1.9  
Contingent Consideration Earn-Out, Fair Value $ 11.6 $ 11.5 103.3
Number of acquisitions subject to potential earn-out payments provisions | acquisition 54 56  
Maximum amount of the potential earn-out payments $ 407.3 $ 436.2  
Business Combination, Contingent Consideration, Liability, Current 78.5 80.1  
Business Combination, Contingent Consideration, Liability, Noncurrent 175.8 228.9  
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles   0.4  
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]      
Business Acquisition [Line Items]      
Business Combination, Contingent Consideration, Liability, Current 50.9 49.6  
Business Combination, Contingent Consideration, Liability 192.0 227.1 $ 229.6
Business Combination, Contingent Consideration, Liability, Noncurrent $ 141.1 $ 177.5