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Earnings (Loss) Per Share (Tables)
 12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Calculation of Earnings Per Share The following table sets forth the calculation of EPS for the years ended December 31, 2020, 2019 and 2018 (in millions, except share and per share data):
 Years Ended December 31,
 202020192018
Weighted average basic common shares outstanding17,754,666 17,917,195 19,452,560 
Dilutive effect of stock-based awards and employee stock purchases51,912 18,879 8,492 
Weighted average dilutive common shares outstanding17,806,578 17,936,074 19,461,052 
Basic:
Net income (loss)$286.5 $174.0 $157.8 
Less: Earnings (loss) allocated to participating securities10.3 6.4 5.4 
Net income (loss) available to basic common shares$276.2 $167.6 $152.4 
Basic earnings (loss) per common share$15.55 $9.35 $7.83 
Diluted:
Net income (loss)$286.5 $174.0 $157.8 
Less: Earnings (loss) allocated to participating securities10.3 6.4 5.4 
Net income (loss) available to diluted common shares$276.2 $167.6 $152.4 
Diluted earnings (loss) per common share$15.51 $9.34 $7.83