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Business Combinations, Goodwill and Other Intangible Assets HFF Acquisition (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition, Equity Interests Issued or Issuable [Line Items]        
Business Combination, Consideration Transferred   $ 846.1 $ 11.6 $ 11.5
Business Acquisition, Fair Value of Intangible Asset at Acquisition Date   $ 349.9    
Document Period End Date   Dec. 31, 2019    
Goodwill, Purchase Accounting Adjustments   $ 1.0    
Line of Credit Facility, Maximum Borrowing Capacity $ 87.1 87.1    
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles   0.5    
Cash Acquired from Acquisition   3.8    
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Liabilities   (1.5)    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net 4.7 4.7 1.1  
Goodwill 4,168.2 4,168.2 2,697.8 $ 2,709.3
Payments to Acquire Businesses, Gross   40.4 101.3  
HFF Acquisition [Member]        
Business Acquisition, Equity Interests Issued or Issuable [Line Items]        
Business Combination, Consideration Transferred   1,870.7    
Business Acquisition, Pro Forma Revenue   18,308.6 16,992.1  
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual   392.3    
Business Combination, Pro Forma Information, Operating Income since Acquisition Date   86.7    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents 262.8 262.8    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Restricted Cash 5.8 5.8    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables 14.8 14.8    
Business Combination, Recognized Identifiable Asset Acquired and Liabilities Assumed, Warehouse Receivables 794.1 794.1    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets 33.5 33.5    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment 18.9 18.9    
Business Combination, Identifiable Assets Acquired and Liabilities Assumed, Operating Lease Right-of-Use Assets 65.3 65.3    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill 349.9 349.9    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other 38.4 38.4    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets 1,577.7 1,577.7    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable 26.7 26.7    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Accrued Compensation and Benefits 55.8 55.8    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Warehouse Facilities 766.0 766.0    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other 63.2 63.2    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities 92.3 92.3    
Business Combination, Identifiable Assets Acquired and Liabilities Assumed, Long-Term Operating Lease Liabilities 55.6 55.6    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other 45.1 45.1    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities 1,104.7 1,104.7    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net 473.0 473.0    
Goodwill 1,397.7 1,397.7    
Business Acquisitions, Pro Forma Net Income (Loss) Attributable to Common Shareholders   611.6 $ 514.1  
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned 809.2 809.2    
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 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      
Business Acquisition, Fair Value of Intangible Asset at Acquisition Date   $ 156.7    
Mortgage servicing rights [Member] | HFF Acquisition [Member]        
Business Acquisition, Equity Interests Issued or Issuable [Line Items]        
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   6 years 2 months 12 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 6 months      
Business Acquisition, Fair Value of Intangible Asset at Acquisition Date   $ 193.2    
Other Intangible Assets [Member] | HFF Acquisition [Member]        
Business Acquisition, Equity Interests Issued or Issuable [Line Items]        
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   6 years