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Business Combinations, Goodwill and Other Intangible Assets Business Combinations, Earn-out Payments (Details) $ in Millions | Sep. 30, 2021 USD ($) acquisition | Dec. 31, 2020 USD ($) acquisition
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Summary of Earn-out Payments [Line Items] |  |
Number Of Acquisitions Subject To Potential Earn Out Payments Provisions | acquisition | 21 | 35
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, High, Value | $ 119.1 | $ 199.2
Business Combination, Contingent Consideration, Liability, Current | 34.1 | 91.7
Business Combination, Contingent Consideration, Liability, Noncurrent | 33.5 | 26.2
Finite-Lived Intangible Assets, Net | 629.1 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Summary of Earn-out Payments [Line Items] |  |
Business Combination, Contingent Consideration, Liability, Current | 25.2 | 77.2
Business Combination, Contingent Consideration, Liability, Noncurrent | $ 20.2 | $ 8.5

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