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Business Combinations, Goodwill and Other Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 2025
Schedule of Business Acquisitions, Pro Forma Revenue [Line Items] |
Summary of Earn-out Payments [Table Text Block] | Earn-Out Payments
($ in millions) | June 30, 2025 |  | December 31, 2024
Number of acquisitions with earn-out payments subject to the achievement of certain performance criteria | 12 |  |  | 13 |
Maximum earn-out payments (undiscounted) | $ | 78.2 |  |  | 108.0 |
Short-term earn-out liabilities (fair value)(1) | 5.2 |  |  | 12.0 |
Long-term earn-out liabilities (fair value)(1) | 13.9 |  |  | 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 Services | Leasing Advisory | Capital Markets Services | Investment Management | Software and Technology Solutions |  | Consolidated
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 movements | 16.5 |  | 35.4 |  | 44.5 |  | 1.6 |  | (0.1) |  |  | 97.9 |
Balance as of June 30, 2025 | $ | 977.7 |  | 1,408.0 |  | 2,022.6 |  | 57.5 |  | 250.0 |  |  | $ | 4,715.8 |
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) | MSRs | Other Intangibles |  | Consolidated
Gross Carrying Amount |  |  |  |
Balance as of December 31, 2024 | $ | 851.1 |  | 543.8 |  |  | $ | 1,394.9 |
Additions, net of adjustments | 40.6 |  | 0.5 |  |  | 41.1 |
Adjustment for fully amortized intangibles | (24.5) |  | (1.2) |  |  | (25.7) |
Impact of exchange rate movements | — |  | 10.0 |  |  | 10.0 |
Balance as of June 30, 2025 | $ | 867.2 |  | 553.1 |  |  | $ | 1,420.3 |
Accumulated Amortization |  |  |  |
Balance as of December 31, 2024 | $ | (380.0) |  | (290.8) |  |  | $ | (670.8) |
Amortization expense, net(1) | (55.4) |  | (34.0) |  |  | (89.4) |
Adjustment for fully amortized intangibles | 24.5 |  | 1.2 |  |  | 25.7 |
Impact of exchange rate movements | — |  | (3.8) |  |  | (3.8) |
Balance as of June 30, 2025 | $ | (410.9) |  | (327.4) |  |  | $ | (738.3) |
Net book value as of June 30, 2025 | $ | 456.3 |  | 225.7 |  |  | $ | 682.0 |
(1) Included in this amount for MSRs was $2.3 million relating 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) | MSRs | Other Intangibles |  | Consolidated
Gross Carrying Amount |  |  |  |
Balance as of December 31, 2023 | $ | 801.8 |  | 546.2 |  |  | $ | 1,348.0 |
Additions, net of adjustments | 34.2 |  | 14.9 |  |  | 49.1 |
Adjustment for fully amortized intangibles | (15.5) |  | (9.3) |  |  | (24.8) |
Impact of exchange rate movements | — |  | (2.5) |  |  | (2.5) |
Balance as of June 30, 2024 | $ | 820.5 |  | 549.3 |  |  | $ | 1,369.8 |
Accumulated Amortization |  |  |  |
Balance as of December 31, 2023 | $ | (309.8) |  | (253.2) |  |  | $ | (563.0) |
Amortization expense, net(1) | (55.4) |  | (32.9) |  |  | (88.3) |
Adjustment for fully amortized intangibles | 15.5 |  | 9.3 |  |  | 24.8 |
Impact of exchange rate movements | — |  | 0.6 |  |  | 0.6 |
Balance as of June 30, 2024 | $ | (349.7) |  | (276.2) |  |  | $ | (625.9) |
Net book value as of June 30, 2024 | $ | 470.8 |  | 273.1 |  |  | $ | 743.9 |
(1) Included in this amount for MSRs was $4.2 million relating 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.

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