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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, 2021 USD ($) acquisition | Dec. 31, 2020 USD ($) acquisition | Dec. 31, 2019 USD ($)
Business Acquisition [Line Items] |  |  |
Servicing Asset at Amortized Cost, Other than Temporary Impairments | $ 31.2 | $ 23.7 |
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 | 10.0 | 0.0 | $ 17.0
Goodwill, acquired during period | 442.3 |  |
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 |  |
Payment for Contingent Consideration Liability, Total | 88.7 |  |
Goodwill Additions, net of adjustments | 442.3 |  |
Business Acquisition, Goodwill, Expected Tax Deductible Amount | 99.8 |  |
Business Acquisitions, Contingent Consideration | $ 68.6 | $ 0.0 | 846.1
Number of acquisitions subject to potential earn-out payments provisions | acquisition | 19 | 35 |
Business Combination, Contingent Consideration Arrangements, Range of OUtcomes, High, Value | $ 149.9 | $ 199.2 |
Business Combination, Contingent Consideration, Liability, Current | 45.8 | 91.7 |
Business Combination, Contingent Consideration, Liability, Noncurrent | 66.3 | 26.2 |
Other Acquisitions [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Acquisitions, Contingent Consideration | 68.6 |  |
Other Acquisitions [Domain] |  |  |
Business Acquisition [Line Items] |  |  |
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 | 39.0 | 77.2 |
Business Combination, Contingent Consideration, Liability | 84.1 | 85.7 | $ 148.5
Business Combination, Contingent Consideration, Liability, Noncurrent | $ 45.1 | $ 8.5 |

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- Definition The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation. Also includes purchase price allocation adjustment for allocations not yet complete at the prior year end. + References No definition available. + Details
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