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Restructuring Activities - Schedule of Expense Incurred By Segments (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Mar. 31, 2023
Jun. 30, 2024
Jun. 30, 2023
Restructuring Cost and Reserve [Line Items]        
Restructuring charges $ 2.3 $ 147.2    
Efficiency And Cost Reduction        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges 88.0   $ 119.0 $ 150.0
Efficiency And Cost Reduction | Corporate, Non-Segment        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges 58.0   89.0 5.0
Efficiency And Cost Reduction | Advisory Services | Operating Segments        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges 0.0   0.0 70.0
Efficiency And Cost Reduction | Global Workplace Solutions | Operating Segments        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges 30.0   30.0 50.0
Efficiency And Cost Reduction | Real Estate Investments | Operating Segments        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges 0.0   0.0 25.0
Employee separation benefits        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges     80.0  
Employee separation benefits | Efficiency And Cost Reduction        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges 51.0   80.0 65.0
Employee separation benefits | Efficiency And Cost Reduction | Corporate, Non-Segment        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges 21.0   50.0 3.0
Employee separation benefits | Efficiency And Cost Reduction | Advisory Services | Operating Segments        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges 0.0   0.0 19.0
Employee separation benefits | Efficiency And Cost Reduction | Global Workplace Solutions | Operating Segments        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges 30.0   30.0 30.0
Employee separation benefits | Efficiency And Cost Reduction | Real Estate Investments | Operating Segments        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges 0.0   0.0 13.0
Lease exit costs | Efficiency And Cost Reduction        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges       46.0
Lease exit costs | Efficiency And Cost Reduction | Corporate, Non-Segment        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges       1.0
Lease exit costs | Efficiency And Cost Reduction | Advisory Services | Operating Segments        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges       39.0
Lease exit costs | Efficiency And Cost Reduction | Global Workplace Solutions | Operating Segments        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges       1.0
Lease exit costs | Efficiency And Cost Reduction | Real Estate Investments | Operating Segments        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges       5.0
Professional fees and other        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges     26.0  
Professional fees and other | Efficiency And Cost Reduction        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges 37.0   39.0 30.0
Professional fees and other | Efficiency And Cost Reduction | Corporate, Non-Segment        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges 37.0   39.0 1.0
Professional fees and other | Efficiency And Cost Reduction | Advisory Services | Operating Segments        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges 0.0   0.0 6.0
Professional fees and other | Efficiency And Cost Reduction | Global Workplace Solutions | Operating Segments        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges 0.0   0.0 19.0
Professional fees and other | Efficiency And Cost Reduction | Real Estate Investments | Operating Segments        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges $ 0.0   $ 0.0 4.0
Subtotal | Efficiency And Cost Reduction        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges       141.0
Subtotal | Efficiency And Cost Reduction | Corporate, Non-Segment        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges       5.0
Subtotal | Efficiency And Cost Reduction | Advisory Services | Operating Segments        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges       64.0
Subtotal | Efficiency And Cost Reduction | Global Workplace Solutions | Operating Segments        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges       50.0
Subtotal | Efficiency And Cost Reduction | Real Estate Investments | Operating Segments        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges       22.0
Depreciation expense | Efficiency And Cost Reduction        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges       9.0
Depreciation expense | Efficiency And Cost Reduction | Corporate, Non-Segment        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges       0.0
Depreciation expense | Efficiency And Cost Reduction | Advisory Services | Operating Segments        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges       6.0
Depreciation expense | Efficiency And Cost Reduction | Global Workplace Solutions | Operating Segments        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges       0.0
Depreciation expense | Efficiency And Cost Reduction | Real Estate Investments | Operating Segments        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges       $ 3.0