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Fair Value Measurements - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Oct. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Estimated fair value of external debt $ 3,400.0   $ 3,300.0  
Gross carrying value of debt 3,300.0   3,300.0  
Unrealized gain (loss) on investments $ (21.5) $ 0.0    
Earn out payment 5 years      
Several Estate Service Companies        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Earn-out liabilities, maximum $ 28.3      
Earn-out liabilities, minimum 0.0      
WeWork        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Unrealized gain (loss) on investments 26.7      
Fair Value, Nonrecurring | Early State Proptech Companies        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investments in real estate ventures 31.5   24.0  
Fair Value, Nonrecurring | WeWork        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity securities, FV-NI       $ 150.0
Unrealized gain (loss) on investments (5.2)      
Fair Value, Nonrecurring | Real Estate Venture Capital Funds        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investments in real estate ventures $ 62.1   $ 54.1