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Consolidated Balance Sheets (Parenthetical) - € / shares	Dec. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Ordinary share capital, par value (in EUR per share)	€ 0.01	€ 0.01
Ordinary share capital, shares authorized (in shares)	350,000,000	350,000,000
Ordinary share capital, shares issued (in shares)	151,847,345	167,847,345
Ordinary share capital, shares outstanding (in shares)	142,674,664	152,992,101
Unvested restricted stock (in shares)	2,429,442	3,007,752
Treasury stock, at cost, shares (in shares)	9,172,681	14,855,244

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Share-based Compensation Arrangement by Share-based Payment Award, Restricted Stock, Unvested

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Face amount or stated value per share of common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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