Earnings Per Share - Schedule of Computations of Weighted Average Shares Outstanding (Detail) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Weighted-average shares outstanding	485.7	418.3	267.9
Share-based payment awards classified as participating securities	1.0	1.5	1.4
Basic weighted-average shares outstanding	486.7	421.3	269.3
Dilutive securities	1.3	1.8	2.2
Diluted weighted-average shares outstanding	488.0	423.1	271.5
Jarden Acquisition [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Dilutive Securities, Effect on Basic Earnings Per Share		$ 1.5