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Earnings per share - Computations of ordinary shares outstanding, excluding nonvested restricted stock - (Details) - shares	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021
Earnings Per Share [Abstract]
Ordinary share issued (in shares)	250,347,345	250,347,345
Treasury shares (in shares)	(4,498,988)	(4,951,897)
Ordinary shares outstanding (in shares)	245,848,357	245,395,448
Unvested restricted stock (in shares)	(5,032,769)	(5,822,811)	(5,254,512)
Ordinary shares outstanding, excluding shares of unvested restricted stock (in shares)	240,815,588	239,572,637

X

- Definition

Common Shares Outstanding For Basic EPS

+ References

No definition available.

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X

- Definition

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

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X

- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21463-112644

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29,30)
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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