XML 85 R73.htm IDEA: XBRL DOCUMENT v3.24.3
Restructuring Activities - Schedule of Expense Incurred By Segments (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Mar. 31, 2023
Sep. 30, 2024
Restructuring Cost and Reserve [Line Items]      
Restructuring charges   $ 147.0 $ 154.0
Efficiency And Cost Reduction      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges $ 64.0   183.0
Efficiency And Cost Reduction | Corporate, Non-Segment      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 36.0   126.0
Efficiency And Cost Reduction | Advisory Services | Operating Segments      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 13.0   13.0
Efficiency And Cost Reduction | Global Workplace Solutions | Operating Segments      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 11.0   40.0
Efficiency And Cost Reduction | Real Estate Investments | Operating Segments      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 4.0   4.0
Employee separation benefits      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges     112.0
Employee separation benefits | Efficiency And Cost Reduction      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 32.0   112.0
Employee separation benefits | Efficiency And Cost Reduction | Corporate, Non-Segment      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 4.0   55.0
Employee separation benefits | Efficiency And Cost Reduction | Advisory Services | Operating Segments      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 13.0   13.0
Employee separation benefits | Efficiency And Cost Reduction | Global Workplace Solutions | Operating Segments      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 11.0   40.0
Employee separation benefits | Efficiency And Cost Reduction | Real Estate Investments | Operating Segments      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 4.0   4.0
Professional fees and other      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges     58.0
Professional fees and other | Efficiency And Cost Reduction      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 32.0   71.0
Professional fees and other | Efficiency And Cost Reduction | Corporate, Non-Segment      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 32.0   71.0
Professional fees and other | Efficiency And Cost Reduction | Advisory Services | Operating Segments      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 0.0   0.0
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
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