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Earnings Per Share (Notes)
 6 Months Ended
Jun. 30, 2022
Earnings Per Share [Abstract]  
Earnings Per Share [Text Block]
11. EARNINGS 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 EndedSix Months Ended
 June 30,June 30,
 2022202120222021
 (in millions, except per share data)
Numerator  
Net income$22.9 $16.0 $23.9 $54.6 
    Less: Net income attributable to participating securities(1.0)(0.6)(1.0)(2.2)
Net income attributable to common shareholders - Basic and Dilutive$21.9 $15.4 $22.9 $52.4 
Denominators  
Basic common shares outstanding -  
   Weighted-average shares outstanding119.5 118.7 119.2 118.5 
        Less: Participating securities(5.0)(4.7)(4.8)(4.7)
    Weighted-average common shares outstanding114.5 114.0 114.4 113.8 
Effect of dilutive securities -  
   Dilutive stock-based compensation0.8 0.4 0.6 0.2 
 
Diluted shares outstanding -  
   Adjusted weighted-average shares after assumed conversions115.3 114.4 115.0 114.0 
   
Basic EPS$0.19 $0.13 $0.20 $0.46 
   
Diluted EPS$0.19 $0.13 $0.20 $0.46