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Share capital - Authorized and issued (Details) (USD $) In Millions, except Share data, unless otherwise specified |  |  |  | 0 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2013 | Aug. 20, 2013 IPO
Equity [Abstract] |  |  |  |
Authorized share capital | $ 33.0 |  |  |
Common share, shares authorized (in shares) | 300,000,000 | 300,000,000 |  |
Common share, par value (in dollars per share) | $ 0.10 | $ 0.10 |  |
Preference shares, shares authorized (in shares) | 30,000,000 | 30,000,000 |  |
Preference shares, par value (in dollars per share) | $ 0.10 | $ 0.10 |  |
Common share, shares issued (in shares) | 103,931,386 | 103,888,916 |  |
Common share, shares outstanding (in shares) | 103,931,386 | 103,888,916 |  |
Preference shares, shares issued (in shares) | 0 | 0 |  |
Class of Stock [Line Items] |  |  |  |
Issuance of common shares (in shares) |  |  |  | 24,832,484
Sale of stock, price per share (in dollars per share) | $ 15.05 |  | $ 10.89 | $ 12.50
Sale of stock, net proceeds |  |  |  | $ 286.0

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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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