Recently Issued Accounting Standards - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Effect of early adoption of ASU, Excess tax benefit from continuing operations	[1]	$ 136.4	$ 17.6
Effect of early adoption of ASU, Additional diluted weighted average common shares	[1]	195,700,000	197,500,000
Effect of early adoption of ASU, Net increase in operating cash flow		$ 17.2	$ 14.7
Effect of early adoption of ASU, Net decrease in financing cash flow		$ (45.7)	26.1
Early Adoption Effect [Member] | Accounting Standards Update 2016-09 [Member] | Restatement Adjustment [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Effect of early adoption of ASU, Excess tax benefit from continuing operations			$ (9.6)
Effect of early adoption of ASU, Additional diluted weighted average common shares			404,347
Effect of early adoption of ASU, Excess tax benefit from discontinued operations			$ (1.0)
Effect of early adoption of ASU, Net increase in earnings per common share			$ 0.05
Effect of early adoption of ASU, Net increase in operating cash flow			$ 6.8
Effect of early adoption of ASU, Net decrease in financing cash flow			$ (6.8)

[1] The Company early adopted ASU 2016-09 on a prospective basis, related to the recognition of excess tax benefits to the income statement which were previously recorded in additional paid-in capital, effective January 1, 2016. This resulted in an additional 404,347 diluted weighted average number of common shares outstanding for the three months ended March 31, 2016, and recognition of excess tax benefits of $9.6 million in net earnings from continuing operations, and $1.0 million in net earnings from discontinued operations for the three months ended March 31, 2016. As a result, continuing operations net earnings per common share increased by $0.05 per share for the three months ended March 31, 2016. Refer to Note 2, “Recently Issued Accounting Standards” of the Notes to Condensed Consolidated Financial Statements for further details.