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Restructuring and Acquisition Charges Restructuring and Related Activities (Tables)
3 Months Ended
Mar. 31, 2022
Restructuring Cost and Reserve [Line Items]  
Restructuring, Impairment, and Other Activities Disclosure [Text Block] Restructuring and acquisition charges are presented in table below.
Three Months Ended March 31,
(in millions)20222021
Severance and other employment-related charges$3.3 1.8 
Restructuring, pre-acquisition and post-acquisition charges14.2 9.5 
Stock-based compensation expense for HFF retention awards2.7 6.0 
Fair value adjustments to earn-out liabilities(0.7)(0.1)
Restructuring and acquisition charges$19.5 17.2