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Earnings Per Share
 9 Months Ended
Sep. 30, 2024
Earnings Per Share [Abstract]  
Earnings Per Share Earnings Per Share
Basic earnings per share is computed by dividing net income by the weighted average number of common shares outstanding for the period. Diluted earnings per share is computed using the weighted average number of common shares outstanding and, when dilutive, common share equivalents. The computation of basic and diluted earnings per share was as follows:
Three Months Ended September 30,Nine Months Ended September 30,
(in millions, except share and per share data)
2024202320242023
Net income
$77.5 $51.9 $317.6 $103.0 
    Add back interest expense, net of tax
2.3 2.5 7.1 — 
Net income, diluted
$79.8 $54.4 $324.7 $103.0 
Weighted average number of common shares outstanding, basic (in thousands)70,123 69,823 70,047 69,715 
Convertible Notes
3,528 3,528 3,528 — 
Stock options
160 237 157 317 
Restricted stock units
140 36 98 79 
Weighted average number of common shares outstanding, diluted (in thousands)
73,951 73,624 73,830 70,111 
Earnings per share
    Basic
$1.11 $0.74 $4.53 $1.48 
    Diluted
$1.08 $0.74 $4.40 $1.47 
The number of common share equivalents excluded from the computation of diluted earnings per share because either the effect would have been anti-dilutive, or the performance criteria related to the units had not yet been met, were as follows:
Three Months Ended September 30,Nine Months Ended September 30,
 (in thousands)
2024202320242023
Convertible Notes
— — — 3,528 
Restricted stock units
491 352 473 294 
Stock options
231 160 243 157 
Total722 512 716 3,979