Capital Stock and Earnings per Share (Tables)

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

Reconciliation of Weighted Average Shares for Basic and Diluted Shares Computations

The following is a reconciliation of weighted average shares for the basic and diluted share computations (in millions):

	For the Years Ended December 31,
	2017		2016		2015
Weighted average shares outstanding for basic net    earnings per share		201.9		200.0		187.4
Effect of dilutive stock options and other    equity awards		1.8		2.4		2.4
Weighted average shares outstanding for diluted net    earnings per share		203.7		202.4		189.8