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Restructuring and Acquisition Charges Restructuring and Related Activities (Tables)
 3 Months Ended
Mar. 31, 2024
Restructuring Cost and Reserve [Line Items]  
Restructuring, Impairment, and Other Activities Disclosure [Text Block] Restructuring and acquisition charges are presented in the table below.
Three Months Ended March 31,
(in millions)20242023
Severance and other employment-related charges$4.5 25.7 
Restructuring, pre-acquisition and post-acquisition charges7.4 8.2 
Stock-based compensation expense for post-acquisition retention awards0.3 1.8 
Fair value adjustments to earn-out liabilities(10.5)— 
Restructuring and acquisition charges$1.7 35.7