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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2022
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The following table sets forth the computation of our basic and diluted EPS available to shareholders of common stock (excluding participating securities):
 Three Months Ended
 March 31,
 20222021
 (in millions, except per share data)
Numerator  
Net income$1.0 $38.6 
    Less: Net income attributable to participating securities— (1.6)
Net income attributable to common shareholders - Basic and Dilutive$1.0 $37.0 
Denominators  
Basic common shares outstanding -  
   Weighted-average shares outstanding118.8 118.3 
        Less: Participating securities(4.6)(4.8)
    Weighted-average common shares outstanding114.2 113.5 
Effect of dilutive securities -  
   Dilutive stock-based compensation0.5 — 
 
Diluted shares outstanding -  
   Adjusted weighted-average shares after assumed conversions114.7 113.5 
   
Basic EPS$0.01 $0.33 
   
Diluted EPS$0.01 $0.33