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Restructuring and Acquisition Charges Restructuring and Related Activities (Tables)
 6 Months Ended
Jun. 30, 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 June 30,Six Months Ended June 30,
(in millions)2024202320242023
Severance and other employment-related charges$7.2 5.8 $11.7 31.5 
Restructuring, pre-acquisition and post-acquisition charges6.1 5.1 13.5 13.3 
Stock-based compensation expense for post-acquisition retention awards0.3 1.5 0.6 3.3 
Fair value adjustments to earn-out liabilities(2.1)(0.6)(12.6)(0.6)
Restructuring and acquisition charges$11.5 11.8 $13.2 47.5