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Restructuring and Acquisition Charges | 12 Months Ended
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Dec. 31, 2022
Restructuring and Related Activities [Abstract] |
Restructuring and Acquisition Charges | 14. RESTRUCTURING AND ACQUISITION CHARGES Restructuring and acquisition charges include cash and non-cash expenses. Cash-based charges primarily consist of (i) severance and employment-related charges, including those related to external service providers, incurred in conjunction with a structural business shift, which can be represented by a notable change in headcount, change in leadership, or transformation of business processes, (ii) acquisition, transaction and integration-related charges, and (iii) other restructuring including lease exit charges. Non-cash charges include (i) stock-based compensation expense for retention awards issued in conjunction with the HFF, Inc. ("HFF") acquisition and (ii) fair value adjustments to earn-out liabilities relating to prior-period acquisition activity. Restructuring and acquisition charges are presented in the table below.
| Year Ended December 31,
(in millions) | 2022 | 2021 | 2020
Severance and other employment-related charges | $ | 44.5 |  | 14.3 |  | 69.0 |
Restructuring, pre-acquisition and post-acquisition charges | 57.5 |  | 50.0 |  | 51.5 |
Stock-based compensation expense for HFF retention awards | 6.1 |  | 17.8 |  | 36.7 |
Fair value adjustments to earn-out liabilities | (3.3) |  | 2.6 |  | (14.8) |
Restructuring and acquisition charges | $ | 104.8 |  | 84.7 |  | 142.4 |
We expect nearly all expenses related to (i) severance and other employment-related charges and (ii) restructuring, pre-acquisition and post-acquisition charges as of December 31, 2022 will be paid during the next twelve months.

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- Definition The entire disclosure for restructuring and related activities. Description of restructuring activities such as exit and disposal activities, include facts and circumstances leading to the plan, the expected plan completion date, the major types of costs associated with the plan activities, total expected costs, the accrual balance at the end of the period, and the periods over which the remaining accrual will be settled. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(e)) -URI https://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -URI https://asc.fasb.org/topic&trid=2175745 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI https://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 + Details
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