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ACQUISITIONS (Schedule of Recognized Identified Assets Acquired and Liabilities Assumed) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 12, 2023
Dec. 31, 2022
Dec. 31, 2021
May 31, 2021
May 24, 2021
Business Acquisition [Line Items]            
Goodwill $ 2,386.2   $ 2,314.8 $ 2,321.0    
Deferred income taxes, net $ (1.0)   $ (1.8)      
OnTheMarket            
Business Acquisition [Line Items]            
Cash and cash equivalents   $ 18.2        
Accounts receivable   2.3        
Goodwill   62.8        
Intangible assets   55.2        
Accrued expenses   (12.7)        
Accrued wages and commissions   (2.0)        
Deferred income taxes, net   (3.0)        
Other assets and liabilities   (0.4)        
Fair value of identifiable net assets acquired   $ 120.4        
Homes.com            
Business Acquisition [Line Items]            
Cash and cash equivalents           $ 0.0
Accounts receivable           1.8
Lease right-of-use assets           0.4
Goodwill           91.9
Intangible assets           53.4
Deferred income taxes, net           7.9
Lease liabilities           (0.4)
Deferred revenue           (1.5)
Other assets and liabilities           (1.3)
Fair value of identifiable net assets acquired         $ 152.2 $ 152.2