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Business Combinations, Goodwill and Other Intangible Assets, Business Combinations Activity (Details) $ in Millions	12 Months Ended
	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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