The following table sets forth the calculation of basic and diluted net earnings per common share under the two-class method for the years ended December 31:



	Year Ended December 31,
(In millions, except per share amounts)	2018			2017			2016
Basic Net Earnings Per Common Share:
Numerator
Net earnings	$	193.1		$	814.9		$	486.4
Distributed and allocated undistributed net earnings to unvested restricted stockholders	(0.9		)	(4.9		)	(3.4		)
Distributed and allocated undistributed net earnings	192.2			810.0			483.0
Distributed net earnings - dividends paid to common stockholders	(101.7		)	(118.7		)	(118.7		)
Allocation of undistributed net earnings to common stockholders	$	90.5		$	691.3		$	364.3
Denominator
Weighted average number of common shares outstanding - basic	159.4			186.9			194.3
Basic net earnings per common share:
Distributed net earnings	$	0.64		$	0.64		$	0.61
Allocated undistributed net earnings to common stockholders	0.57			3.69			1.88
Basic net earnings per common share	$	1.21		$	4.33		$	2.49
Diluted Net Earnings Per Common Share:
Numerator
Distributed and allocated undistributed net earnings to common stockholders	$	192.2		$	810.0		$	483.0
Add: Allocated undistributed net earnings to unvested restricted stockholders	0.5			4.3			2.6
Less: Undistributed net earnings reallocated to unvested restricted stockholders	(0.5		)	(4.3		)	(2.6		)
Net earnings available to common stockholders - diluted	$	192.2		$	810.0		$	483.0
Denominator
Weighted average number of common shares outstanding - basic	159.4			186.9			194.3
Effect of contingently issuable shares	0.1			0.7			1.2
Effect of unvested restricted stock units	0.3			0.7			0.7
Weighted average number of common shares outstanding - diluted under two-class	159.8			188.3			196.2
Effect of unvested restricted stock - participating security	0.4			0.6			1.0
Weighted average number of common shares outstanding - diluted under treasury stock	160.2			188.9			197.2
Diluted net earnings per common share	$	1.20		$	4.29		$	2.46