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Net Income per Common Share Computations
 12 Months Ended
Dec. 31, 2021
Earnings Per Share [Abstract]  
Net Income Per Common Share Computations NET INCOME (LOSS) PER COMMON SHARE COMPUTATIONS
The following is a reconciliation of the numerator and denominator of the net income (loss) per common share computations:
Years Ended December 31,
(in millions, except per share data)202120202019
Numerator for basic net income (loss) per common share:
Net income from continuing operations$249.1 $13.3 $139.6 
Net loss attributable to noncontrolling interest— (0.2)(0.3)
Net income from continuing operations, net of loss attributable to noncontrolling interests249.1 13.5 139.9 
Net loss from discontinued operations— (95.4)(2.4)
Numerator for basic net income (loss) per common share$249.1 $(81.9)$137.5 
Numerator for diluted net income from continuing operations per common share$249.1 $13.5 $139.9 
Numerator for diluted net income (loss) per common share$249.1 $(81.9)$137.5 
Denominator for net income (loss) per common share:
Basic38.6 39.6 40.1 
Plus dilutive effect of stock awards0.6 0.5 0.5 
Diluted39.2 40.1 40.6 
Net income (loss) per common share data:
Basic
Continuing operations$6.45 $0.34 $3.49 
Discontinued operations$— $(2.41)$(0.06)
Net income (loss) per common share - basic$6.45 $(2.07)$3.43 
Diluted
Continuing operations$6.35 $0.33 $3.44 
Discontinued operations (1)
$— $(2.41)$(0.06)
Net income (loss) per common share - diluted$6.35 $(2.08)$3.38 
(1) Amounts exclude all potential common equivalent shares for periods when there is a net loss from discontinued operations.