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Net Income (Loss) Per Share
9 Months Ended
Sep. 30, 2023
Earnings Per Share [Abstract]  
Net Income (Loss) Per Share Net Income (Loss) Per Share
Basic net income (loss) per share is computed by dividing net income (loss) by the weighted average number of common shares outstanding for the period. Diluted net income (loss) 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 net income (loss) per share was as follows:
Three Months Ended September 30,Nine Months Ended September 30,
(in millions, except share and per share data)
2023202220232022
Net income (loss)
$51.9 $(5.2)$103.0 $(12.4)
    Add back interest expense, net of tax
2.5 — — — 
Net income (loss), diluted
$54.4 $(5.2)$103.0 $(12.4)
Weighted average number of common shares outstanding, basic (in thousands)
69,823 69,418 69,715 69,343 
Stock options237 — 317 — 
Restricted stock units36 — 79 — 
Convertible Notes
3,528 — — — 
Weighted average number of common shares outstanding, diluted (in thousands)
73,624 69,418 70,111 69,343 
Net income (loss) per share
    Basic
$0.74 $(0.08)$1.48 $(0.18)
    Diluted
$0.74 $(0.08)$1.47 $(0.18)
The number of common share equivalents excluded from the computation of diluted net income (loss) 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)
2023202220232022
Restricted stock units352 227 294 314 
Stock options160 595 157 602 
Convertible Notes— 3,528 3,528 3,528 
Total512 4,350 3,979 4,444