Earnings Per Share - Reconciliation of Weighted Average Share for Basic and Diluted Share Computations (Detail) - shares shares in Millions	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Jun. 30, 2015	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Weighted average shares outstanding for basic net earnings per share	203.5	169.0		182.1	168.8
Effect of dilutive stock options and other equity awards	2.2	2.7		2.6	2.7
Weighted average shares outstanding for diluted net earnings per share	205.7	171.7	171.5	184.7	171.5