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Business Combinations, Goodwill and Other Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2025
Schedule of Business Acquisitions, Pro Forma Revenue [Line Items]  
Summary of Earn-out Payments [Table Text Block]
Earn-Out Payments
($ in millions)September 30, 2025December 31, 2024
Number of acquisitions with earn-out payments subject to the achievement of certain performance criteria12 13 
Maximum earn-out payments (undiscounted)$75.2 108.0 
Short-term earn-out liabilities (fair value)(1)
6.0 12.0 
Long-term earn-out liabilities (fair value)(1)
10.1 23.8 
(1) Included in Other current and Other long-term liabilities on the Consolidated Balance Sheets.
Movements in Goodwill by Reporting Segment
The following table details, by reporting segment, movements in goodwill.
(in millions)Real Estate Management ServicesLeasing AdvisoryCapital Markets ServicesInvestment ManagementSoftware and Technology SolutionsConsolidated
Balance as of January 1, 2025$961.2 1,372.6 1,971.5 55.9 250.1 $4,611.3 
Additions, net of adjustments— — 6.6 — — 6.6 
Impact of exchange rate movements13.9 32.6 39.9 1.3 (0.1)87.6 
Balance as of September 30, 2025$975.1 1,405.2 2,018.0 57.2 250.0 $4,705.5 
Movements in Gross Carrying Amount and Accumulated Amortization of Finite-Lived Intangible Assets The following tables detail, by intangible type, movements in the gross carrying amount and accumulated amortization of our identifiable intangibles.
(in millions)MSRsOther IntangiblesConsolidated
Gross Carrying Amount 
Balance as of December 31, 2024$851.1 543.8 $1,394.9 
Additions, net of adjustments72.1 0.5 72.6 
Adjustment for fully amortized intangibles(41.0)(218.1)(259.1)
Impact of exchange rate movements— 9.7 9.7 
Balance as of September 30, 2025$882.2 335.9 $1,218.1 
Accumulated Amortization 
Balance as of December 31, 2024$(380.0)(290.8)$(670.8)
Amortization expense, net(1)
(87.4)(43.9)(131.3)
Adjustment for fully amortized intangibles41.0 218.1 259.1 
Impact of exchange rate movements— (3.7)(3.7)
Balance as of September 30, 2025$(426.4)(120.3)$(546.7)
Net book value as of September 30, 2025$455.8 215.6 $671.4 
(1) Included in this amount for MSRs was $5.8 million related to write-offs due to prepayments of sold warehouse receivables for which we retained the servicing rights. Amortization of MSRs is included in Revenue within the Consolidated Statements of Comprehensive Income.
(in millions)MSRsOther IntangiblesConsolidated
Gross Carrying Amount 
Balance as of December 31, 2023$801.8 546.2 $1,348.0 
Additions, net of adjustments52.0 15.5 67.5 
Adjustment for fully amortized intangibles(25.3)(9.9)(35.2)
Impact of exchange rate movements— 1.8 1.8 
Balance as of September 30, 2024$828.5 553.6 $1,382.1 
Accumulated Amortization 
Balance as of December 31, 2023$(309.8)(253.2)$(563.0)
Amortization expense, net(1)
(82.6)(49.5)(132.1)
Adjustment for fully amortized intangibles25.3 9.9 35.2 
Impact of exchange rate movements— (1.1)(1.1)
Balance as of September 30, 2024$(367.1)(293.9)$(661.0)
Net book value as of September 30, 2024$461.4 259.7 $721.1 
(1) Included in this amount for MSRs was $6.0 million related to write-offs due to prepayments of sold warehouse receivables for which we retained the servicing rights. Amortization of MSRs is included in Revenue within the Consolidated Statements of Comprehensive Income.
Business Combinations, Goodwill and Other Intangible Assets [Table]
The following table details cash payments relating to acquisitions. Payments for current-year acquisitions are included in cash used in investing activities, while payments for prior-year acquisitions are primarily reflected in cash used in financing activities.
Nine Months Ended September 30,
(in millions)20252024
Payments relating to current-year acquisitions$6.1 40.8 
Payments for deferred business acquisition and earn-out obligations16.3 5.1 
Total paid for business acquisitions22.4 45.9