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Stockholders' Equity - Total Share-based Incentive Compensation Expense (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2015 | [1] | Jun. 30, 2015 | [1] | Jun. 30, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |  |
Total share-based incentive compensation expense | $ 14.9 | $ 33.2 | $ 26.4
[1] | 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 other cash-based awards. See Stock Appreciation Rights above for further details of SARs. At June 30, 2015, our other cash-based awards were not material to our condensed consolidated financial positions or results of operations.

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- References No definition available. + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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