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Earnings (Loss) per Share - Additional Information (Detail) - shares shares in Millions			12 Months Ended
	Dec. 31, 2018	Dec. 17, 2018	Dec. 31, 2018	Dec. 17, 2018	Dec. 31, 2017	Dec. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Convertible preferred stock terms of conversion		1 mandatory convertible preferred share to 16 ADSs, and all of the accumulated and unpaid dividends on the mandatory convertible preferred shares were paid in ADSs, at a ratio of 3.0262
Ordinary shares issued upon mandatory conversion of preferred shares	70.6	70.6
Stock Option Restricted Stock Units And Performance Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average shares with anti-dilutive effect on earnings per share			51.0		38.0
Convertible Preferred Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average shares with anti-dilutive effect on earnings per share				74.0	59.0	59.0
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average shares with anti-dilutive effect on earnings per share						4.0

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Specific terms relevant to convertibility. Includes class of preferred stock and number of shares convertible into, exercise (or conversion) price or rates, dates relevant to conversion timing and events relevant to conversion. Describe also any beneficial conversion features. where convertible preferred stock with a nondetachable conversion feature is in-the-money at commitment date. For contingently convertible preferred stock, discuss the circumstances of the contingency, including the events or changes in circumstance that would cause the contingency to be met and any of the significant features necessary to understand the conversion rights and the timing of those rights. Include also an events or changes in circumstance, if any, that could adjust or change the contingency, conversion price, or number of shares, including significant terms of those changes.

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