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Shareholders' equity (Details) (USD $) In Millions, except Share data, unless otherwise specified | Dec. 31, 2013 | Dec. 19, 2013 | Mar. 20, 2013 | Mar. 19, 2013
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Equity [Abstract] |  |  |  |
Common stock reserved for future issuance | 16,231,674 |  |  |
Common stock reserved for future issuance in equity forward transaction | 5,700,000 |  |  |
Public offering related to equity forward transaction (in shares) |  |  |  | 6,100,000
Sale of common stock related to equity forward transaction (in dollars per share) |  |  |  | $ 26.75
Closing price of common stock (in dollar per share) |  |  |  | $ 27.01
Offering related to underwriters exercising their over-allotment option under equity forward transaction (in shares) |  |  | 900,000 |
Shares borrowed by forward counterparty from third party | 7,000,000 |  |  |
Underwriting discount (in dollars per share) | $ 1.00312 |  |  |
Forward sale price (in dollars per share) | $ 25.74688 |  |  |
Initial fair value (in dollars per share) | $ 0 |  |  |
Delivery of net shares on settlement | 188,000 | 1,300,000 |  |
Delivery of cash on settlement | $ 5.0 | $ 32.1 |  |
Underwriting discount included in delivery of cash | 6.0 | 1.3 |  |
Cash in exchange of physical delivery of shares on settlement | $ 141 |  |  |

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- Definition Represents the amount of cash in exchange of physical delivery of shares to forward counterparty on settlement of equity forward transaction. + References No definition available. + Details
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- Definition Represents the amount of delivery of net shares to forward counterparty on settlement of equity forward transaction. + References No definition available. + Details
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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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 + Details
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