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Fair Value Measurements - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Mar. 18, 2021
Aug. 13, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                  
Investment in VTS   $ (100,700)     $ (100,720) $ 0 $ 0    
Investments in unconsolidated subsidiaries, fair value $ 353,000       353,000 257,900      
Asset impairments       $ 10,400 58,713 0 88,676    
Goodwill impairment 21,900       26,405 0      
Non-public entity designated as trading debt security 10,000       10,000        
Notes payable on real estate 52,700       52,700 48,200      
Real Estate Investments                  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                  
Goodwill impairment $ 21,900   $ 26,400   26,405 0      
Global Workplace Solutions                  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                  
Asset impairments             50,200    
Goodwill impairment         $ 0 0 25,000    
Tangible Asset Impairment Charges             $ 13,500    
4.875% Senior Notes                  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                  
Interest rate 4.875%       4.875%        
4.875% Senior Notes | Senior Notes                  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                  
Interest rate                 4.875%
Senior notes $ 596,400       $ 596,400 $ 595,500      
2.500% Senior Notes                  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                  
Interest rate           2.50% 2.50%    
2.500% Senior Notes | Senior Notes                  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                  
Interest rate 2.50%       2.50%     2.50%  
Estimated Fair Value                  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                  
Senior term loans $ 424,600       $ 424,600 $ 451,800      
Estimated Fair Value | 4.875% Senior Notes                  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                  
Senior notes 595,200       595,200 671,700      
Estimated Fair Value | 2.500% Senior Notes | Senior Notes                  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                  
Senior notes 396,800       396,800 502,100      
Actual Carrying Value                  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                  
Senior term loans 427,800       427,800 454,500      
Actual Carrying Value | 4.875% Senior Notes                  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                  
Senior notes 596,400       596,400 595,500      
Actual Carrying Value | 2.500% Senior Notes | Senior Notes                  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                  
Senior notes $ 489,300       $ 489,300 $ 488,100