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Earnings (Loss) Per Share (Notes)
 9 Months Ended
Sep. 30, 2024
Earnings Per Share [Abstract]  
Earnings Per Share [Text Block]
14. EARNINGS (LOSS) PER SHARE (EPS)

We present EPS using the two-class method. This method allocates undistributed earnings between common shares and non-vested share-based payment awards that entitle the holder to non-forfeitable dividend rights. Our participating securities are our non-vested restricted stock units.

The following table sets forth the computation of our basic and diluted EPS available to shareholders of common stock (excluding participating securities):
 Three Months EndedNine Months Ended
 September 30,September 30,
 2024202320242023
 (in millions, except per share data)
Numerator  
Net income (loss) $10.0 $(17.4)$48.7 $(14.5)
    Less: Net income attributable to participating securities(0.4)— (1.7)— 
Net income (loss) attributable to common shareholders - Basic and Dilutive$9.6 $(17.4)$47.0 $(14.5)
Denominators  
Basic common shares outstanding -  
   Weighted-average shares outstanding122.0 120.5 121.6 120.3 
        Less: Weighted-average participating securities(4.4)(3.4)(4.1)(3.8)
    Weighted-average common shares outstanding117.6 117.1 117.5 116.5 
Effect of dilutive securities -  
   Dilutive stock-based compensation0.2 — 0.1 — 
 
Diluted shares outstanding -  
   Adjusted weighted-average shares after assumed conversions117.8 117.1 117.6 116.5 
   
Basic EPS$0.08 $(0.15)$0.40 $(0.12)
   
Diluted EPS$0.08 $(0.15)$0.40 $(0.12)
Basic and dilutive loss per share are the same for the three and nine months ended September 30, 2023 because the effect of potentially dilutive stock-based compensation would have been antidilutive. Excluded dilutive shares were 0.3 million and 0.2 million for the three and nine months ended September 30, 2023, respectively.