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Earnings (Loss) Per Share
 12 Months Ended
Dec. 31, 2021
Earnings Per Share [Abstract]  
Earnings (Loss) Per Share Earnings (Loss) Per ShareBasic EPS amounts are calculated by dividing net income (loss) allocated to common stockholders by the weighted average number of common shares outstanding.  Diluted EPS amounts assume the issuance of common stock for all potentially dilutive common shares outstanding.  
The following table shows the basic and diluted earnings (loss) per share for 2021, 2020, and 2019:
 
For the year ended December 31, 2021
 Net (Loss)
Shares
(in millions)
Per Share
Net loss$(167.1) 
Amount allocated to common stockholders100 %  
Basic and Diluted EPS:(1)
$(167.1)90.2 $(1.85)
 
For the year ended December 31, 2020
 Net (Loss)
Shares
(in millions)
Per Share
Net loss$(123.3) 
Amount allocated to common stockholders100 %  
Basic and Diluted EPS:(1)
$(123.3)89.5 $(1.38)
 
For the year ended December 31, 2019
 Net Income
Shares
(in millions)
Per Share
Net income$(80.8)  
Amount allocated to common stockholders100 %  
Basic and Diluted EPS:(1)
$(80.8)88.8 $(0.91)

Securities excluded from the calculation of diluted EPS (in millions)(1):
2021
2020
2019
Share-based compensation
2.7 1.3 0.3 
Convertible preferred shares6.3 6.6 6.9 
Convertible senior notes4.8 — — 

(1)In periods when we report a net loss, all share-based compensation awards, convertible preferred shares and convertible senior notes are excluded from the calculation of diluted weighted average shares outstanding because of their anti-dilutive effect on earnings (loss) per share.