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Business Combinations, Goodwill and Other Intangible Assets, Business Combinations Activity (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2022 USD ($) acquisition | Dec. 31, 2021 USD ($) acquisition | Dec. 31, 2020 USD ($)
Business Acquisition [Line Items] |  |  |
Payment for Contingent Consideration Liability, Total | $ 18.1 | $ 88.7 |
Number of Businesses Acquired | acquisition |  | 4 |
Payments to Acquire Businesses, Gross |  | $ 416.8 |
Cash Acquired from Acquisition |  | 13.9 |
Business Combinations, Guaranteed Deferred Acquisition Obligation | 3.1 | 10.0 | $ 0.0
Business Acquisitions, Contingent Consideration | $ 5.3 | 68.6 | 0.0
Finite-lived intangible assets acquired |  | 210.2 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  | 34.6 |
Redeemable Noncontrolling Interest, Acquisition Date Fair Value |  | 122.5 |
Business Acquisition, Goodwill, Expected Tax Deductible Amount |  | $ 99.8 |
Number of acquisitions subject to potential earn-out payments provisions | acquisition | 17 | 19 |
Business Combination, Contingent Consideration Arrangements, Range of OUtcomes, High, Value | $ 114.6 | $ 149.9 |
Business Combination, Contingent Consideration, Liability, Current | 23.1 | 45.8 |
Business Combination, Contingent Consideration, Liability, Noncurrent | 76.3 | 66.3 |
Goodwill | 4,528.0 | 4,611.6 |
Goodwill Additions, net of adjustments | 13.5 |  |
Goodwill, Foreign Currency Translation Gain (Loss) | (97.1) |  |
Identified intangibles, net of accumulated amortization | 858.5 | 887.0 |
Servicing Asset at Amortized Cost, Other than Temporary Impairments | 28.0 | 31.2 |
Other Acquisitions [Domain] |  |  |
Business Acquisition [Line Items] |  |  |
Business Acquisitions, Contingent Consideration |  | 68.6 |
Goodwill, acquired during period |  | 442.3 |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Contingent Consideration, Liability, Current | 5.0 | 39.0 |
Business Combination, Contingent Consideration, Liability, Noncurrent | 68.3 | 45.1 |
Business Combination, Contingent Consideration, Liability | $ 73.2 | $ 84.1 | $ 85.7

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