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Restructuring and Acquisition Charges
 12 Months Ended
Dec. 31, 2024
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 prior-period acquisitions 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)202420232022
Severance and other employment-related charges$27.1 62.1 44.5 
Restructuring, pre-acquisition and post-acquisition charges26.3 39.6 57.5 
Stock-based compensation expense for post-acquisition retention awards2.3 3.4 6.1 
Fair value adjustments to earn-out liabilities(32.6)(4.4)(3.3)
Restructuring and acquisition charges$23.1 100.7 104.8 
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, 2024 will be paid during the next twelve months.