Net Income Per Common Share (Tables)

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Calculations For Basic And Diluted Earnings Per Share

The table shows calculations for basic and diluted earnings per share:

(In millions, except per share data)	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018		2017
Numerator:
Net income—basic and diluted	$	217	$	100	$	186	$	301
Denominator:
Basic weighted-average common shares outstanding	163.2		164.3		163.6		164.4
Effect of share-based awards:
Stock options	0.8		1.0		0.9		1.1
Nonvested shares	0.5		0.7		0.5		0.7
Diluted weighted-average shares	164.5		166.0		165.0		166.2
Earnings per share:
Basic	$	1.33	$	0.61	$	1.13	$	1.83
Diluted	$	1.32	$	0.60	$	1.12	$	1.81
Number of anti-dilutive share-based awards	1.3		0.6		1.3		0.7