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Net Earnings Per Common Share (Tables)
 9 Months Ended
Sep. 30, 2020
Earnings Per Share [Abstract]  
Calculation of Basic and Diluted Net Earnings Per Common Share
The following table shows the calculation of basic and diluted net earnings per common share under the two-class method: 
Three Months Ended
September 30,		Nine Months Ended
September 30,
(In millions, except per share amounts)2020201920202019
Basic Net Earnings Per Common Share:
Numerator:
Net earnings$134.0 $68.0 $360.7 $158.7 
Distributed and allocated undistributed net earnings to unvested restricted stockholders— (0.1)(0.1)(0.3)
Distributed and allocated undistributed net earnings134.0 67.9 360.6 158.4 
Distributed net earnings - dividends paid to common stockholders(24.9)(24.6)(74.6)(74.1)
Allocation of undistributed net earnings to common stockholders$109.1 $43.3 $286.0 $84.3 
Denominator:
Weighted average number of common shares outstanding - basic155.5 154.0 155.2 154.4 
Basic net earnings per common share:
Distributed net earnings$0.16 $0.16 $0.48 $0.48 
Allocated undistributed net earnings to common stockholders0.70 0.28 1.84 0.55 
Basic net earnings per common share$0.86 $0.44 $2.32 $1.03 
Diluted Net Earnings Per Common Share:
Numerator:
Distributed and allocated undistributed net earnings$134.0 $67.9 $360.6 $158.4 
Add: Allocated undistributed net earnings to unvested restricted stockholders— 0.1 0.1 0.2 
Less: Undistributed net earnings reallocated to unvested restricted stockholders— (0.1)(0.1)(0.2)
Net earnings available to common stockholders - diluted$134.0 $67.9 $360.6 $158.4 
Denominator:
Weighted average number of common shares outstanding - basic155.5 154.0 155.2 154.4 
Effect of unvested restricted stock - nonparticipating security0.1 — 0.1 — 
Effect of contingently issuable shares 0.2 0.2 0.2 0.2 
Effect of unvested restricted stock units0.3 0.3 0.3 0.3 
Weighted average number of common shares outstanding - diluted under two-class156.1 154.5 155.8 154.9 
Effect of unvested restricted stock - participating security— 0.3 — 0.3 
Weighted average number of common shares outstanding - diluted under treasury stock156.1 154.8 155.8 155.2 
Diluted net earnings per common share$0.86 $0.44 $2.31 $1.02