Net Income Per Common Share (Tables)

6 Months Ended

Jun. 30, 2017

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,
	2017		2016		2017		2016
Numerator:
Net income—basic and diluted	$	100	$	123	$	301	$	311
Denominator:
Basic weighted-average common shares   outstanding	164.3		164.5		164.4		164.4
Effect of share-based awards:
Stock options	1.0		1.1		1.1		1.1
Nonvested shares	0.7		0.9		0.7		0.8
Diluted weighted-average shares	166.0		166.5		166.2		166.3
Earnings per share:
Basic	$	0.61	$	0.75	$	1.83	$	1.89
Diluted	0.60		0.74		1.81		1.87
Number of anti-dilutive share-based awards	0.6		0.3		0.7		0.4