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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
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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Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled within one year or the normal operating cycle, if longer.

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