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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
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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

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