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Net Income Per Common Share Computations
 12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Net Income Per Common Share Computations NET INCOME PER COMMON SHARE COMPUTATIONS
The following is a reconciliation of the numerator and denominator of the net income per common share computations:
Years Ended December 31,
(in millions, except per share data)201920182017
Numerator for basic net income per common share:
Net income from continuing operations$139.6  $182.6  $122.4  
Net loss attributable to noncontrolling interest(0.3) —  —  
Net income from continuing operations, net of loss attributable to noncontrolling interests139.9  182.6  122.4  
Net income from continuing operations allocated to participating securities—  —  (0.1) 
Net (loss) income from discontinued operations(2.4) 170.2  18.1  
Numerator for basic net income per common share$137.5  $352.8  $140.4  
Numerator for diluted net income from continuing operations per common share$139.9  $182.6  $122.4  
Numerator for diluted net income per common share$137.5  $352.8  $140.5  
Denominator for net income per common share:
Basic40.1  41.3  47.2  
Plus dilutive effect of stock awards0.5  0.3  0.6  
Plus dilutive effect of participating securities—  —  0.2  
Diluted40.6  41.6  48.0  
Net income (loss) per common share data:
Basic
Continuing operations$3.49  $4.42  $2.59  
Discontinued operations$(0.06) $4.12  $0.38  
Net income per common share - basic$3.43  $8.54  $2.97  
Diluted
Continuing operations$3.44  $4.39  $2.55  
Discontinued operations$(0.06) $4.09  $0.37  
Net income per common share - diluted$3.38  $8.48  $2.92