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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, 2023 USD ($) acquisition | Dec. 31, 2022 USD ($) acquisition | Dec. 31, 2021 USD ($)
Business Acquisition [Line Items] |  |  |
Payment for Contingent Consideration Liability, Total | $ 26.8 | $ 18.1 |
Number of Businesses Acquired | acquisition | 1 |  |
Goodwill, acquired during period | $ 18.7 |  |
Finite-lived intangible assets acquired | 2.1 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net | $ 2.8 |  |
Number of acquisitions subject to potential earn-out payments provisions | acquisition | 14 | 17 |
Business Combination, Contingent Consideration Arrangements, Range of OUtcomes, High, Value | $ 100.0 | $ 114.6 |
Business Combination, Contingent Consideration, Liability, Current | 19.6 | 23.1 |
Other Payments to Acquire Businesses | 10.0 |  |
Payments to Acquire Businesses, Net of Cash Acquired | 13.6 | 5.7 | $ 416.8
Business Combination, Contingent Consideration, Liability, Noncurrent | 51.1 | 76.3 |
Goodwill | 4,587.4 | 4,528.0 | 4,611.6
Goodwill Additions, net of adjustments | 18.7 | 13.5 |
Goodwill, Foreign Currency Translation Gain (Loss) | 41.3 | (97.1) |
Identified intangibles, net of accumulated amortization | 785.0 | 858.5 |
Servicing Asset at Amortized Cost, Other than Temporary Impairments | 10.0 | 28.0 |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Contingent Consideration, Liability, Current | 12.0 | 5.0 |
Business Combination, Contingent Consideration, Liability, Noncurrent | 45.5 | 68.3 |
Business Combination, Contingent Consideration, Liability | $ 57.5 | $ 73.2 | $ 84.1

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