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Business Combinations, Goodwill and Other Intangible Assets HFF Acquisition (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Business Combination, Consideration Transferred	$ 0.0	$ 846.1	$ 11.6
Document Period End Date	Dec. 31, 2020
Line of Credit Facility, Maximum Borrowing Capacity	$ 64.7
Cash Acquired from Acquisition		3.8
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net		4.7
Goodwill	4,224.7	4,168.2	$ 2,697.8
Payments to Acquire Businesses, Gross		40.4
HFF Acquisition [Member]
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Business Combination, Consideration Transferred		1,870.7
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents		262.8
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Restricted Cash		5.8
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill		349.9
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets		1,227.8
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities		1,104.7
Goodwill		1,397.7
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned		809.2
Shares Issued to Replace Legacy Awards		32.0
Payments to Acquire Businesses, Gross		$ 1,029.5
Line of Credit [Member]
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 2,750.0
Mortgage servicing rights [Member]
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	4 years 4 months 24 days
Other Intangible Assets [Member]
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	3 years 2 months 12 days

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