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Business Combinations, Goodwill and Other Intangible Assets Business Combinations, Earn-out Payments (Details) $ in Millions | Sep. 30, 2020 USD ($) acquisition | Dec. 31, 2019 USD ($) acquisition
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Summary of Earn-out Payments [Line Items] |  |
Number Of Acquisitions Subject To Potential Earn Out Payments Provisions | acquisition | 42 | 44
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High | $ 221.3 | $ 268.9
Business Combination, Contingent Consideration, Liability, Current | 92.6 | 74.4
Business Combination, Contingent Consideration, Liability, Noncurrent | 39.6 | 124.1
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Summary of Earn-out Payments [Line Items] |  |
Business Combination, Contingent Consideration, Liability, Current | 77.0 | 53.9
Business Combination, Contingent Consideration, Liability, Noncurrent | $ 18.0 | $ 94.5

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