Stockholders' Equity - Total Share-based Incentive Compensation Expense (Parenthetical) (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based incentive compensation expense	[1],[2]	$ 11.6	$ 15.0
Discontinued Operations Held for Sale [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based incentive compensation expense		$ 3.5	$ 3.4

[1] Of the consolidated share-based incentive compensation expense, $3.5 million for the three months ended March 31, 2017 and $3.4 million for the three months ended March 31, 2016 were allocated to net earnings from discontinued operations, net of tax on the Condensed Consolidated Statement of Operations.

[2] The amounts included above do not include the expense related to our U.S. profit sharing contributions made in the form of our common stock or the expense or income related to SARs and certain cash-based awards. At March 31, 2017 and March 31, 2016, our other cash-based awards were not material to our Condensed Consolidated Balance Sheet or Statement of Operations.