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Earnings (Loss) Per Share (Notes)
 9 Months Ended
Sep. 30, 2023
Earnings Per Share [Abstract]  
Earnings Per Share [Text Block]
11. 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,
 2023202220232022
 (in millions, except per share data)
Numerator  
Net income (loss)$(17.4)$26.5 $(14.5)$50.4 
    Less: Net income attributable to participating securities— (1.1)— (2.0)
Net income (loss) attributable to common shareholders - Basic and Dilutive$(17.4)$25.4 $(14.5)$48.4 
Denominators  
Basic common shares outstanding -  
   Weighted-average shares outstanding120.5 119.6 120.3 119.3 
        Less: Weighted-average participating securities(3.4)(5.0)(3.8)(4.9)
    Weighted-average common shares outstanding117.1 114.6 116.5 114.4 
Effect of dilutive securities -  
   Dilutive stock-based compensation— 1.5 — 0.9 
 
Diluted shares outstanding -  
   Adjusted weighted-average shares after assumed conversions117.1 116.1 116.5 115.3 
   
Basic EPS$(0.15)$0.22 $(0.12)$0.42 
   
Diluted EPS$(0.15)$0.22 $(0.12)$0.42 

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 potentially dilutive shares were 0.3 million and 0.2 million for the three and nine months ended September 30, 2023, respectively.