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Restructuring and Acquisition Charges
 6 Months Ended
Jun. 30, 2023
Restructuring Cost and Reserve [Line Items]  
Restructuring and Related Activities Disclosure [Text Block] 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.
Three Months Ended June 30,Six Months Ended June 30,
(in millions)2023202220232022
Severance and other employment-related charges$5.8 8.3 $31.5 11.6 
Restructuring, pre-acquisition and post-acquisition charges5.1 13.9 13.3 28.1 
Stock-based compensation expense for post-acquisition retention awards1.5 2.7 3.3 5.4 
Fair value adjustments to earn-out liabilities(0.6)1.0 (0.6)0.3 
Restructuring and acquisition charges$11.8 25.9 $47.5 45.4 
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 June 30, 2023 will be paid during the next twelve months.