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Business Combinations, Goodwill and Other Intangible Assets Business Combinations, Earn-out Payments (Details)
$ in Millions
Jun. 30, 2019
USD ($)
acquisition
Dec. 31, 2018
USD ($)
acquisition
Summary of Earn-out Payments [Line Items]    
Number Of Acquisitions Subject To Potential Earn Out Payments Provisions | acquisition 50 54
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High $ 369.3 $ 407.3
Business Combination, Contingent Consideration, Liability, Current 91.0 78.5
Business Combination, Contingent Consideration, Liability, Noncurrent 146.2 175.8
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Summary of Earn-out Payments [Line Items]    
Business Combination, Contingent Consideration, Liability, Current 68.9 50.9
Business Combination, Contingent Consideration, Liability, Noncurrent $ 111.4 $ 141.1