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Earnings per share and shareholders' equity (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Jul. 14, 2014 | Dec. 19, 2013 | Mar. 20, 2013 | Mar. 19, 2013
Earnings per share, basic and diluted |  |  |  |  |  |  |  |
Distributed earnings, Basic (dollars per share) | $ 0.31 | $ 0.31 | $ 0.93 | $ 0.93 |  |  |  |
Distributed earnings, Diluted (dollars per share) | $ 0.31 | $ 0.31 | $ 0.93 | $ 0.93 |  |  |  |
Undistributed earnings, Basic (dollars per share) | $ 0.16 | $ 0.18 | $ 0.40 | $ 0.31 |  |  |  |
Undistributed earnings, Diluted (dollars per share) | $ 0.15 | $ 0.17 | $ 0.39 | $ 0.30 |  |  |  |
Earnings per share, Basic (in dollars per share) | $ 0.47 | $ 0.49 | $ 1.33 | $ 1.24 |  |  |  |
Earnings per share, Diluted (in dollars per share) | $ 0.46 | $ 0.48 | $ 1.32 | $ 1.23 |  |  |  |
Equity forward transaction |  |  |  |  |  |  |  |
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 |  | $ 26.75 |  |  |  |  | $ 26.75
Underwriting discount (in dollars per share) | $ 1.00312 |  | $ 1.00312 |  |  |  |  |
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 |  | 7,000,000 |  |  |  |  |
Underwriting discount |  |  |  |  | $ 1.0 | $ 1.3 |  |
Capital shares reserved for future issuance, equity forward transaction | 4,700,000 |  | 4,700,000 |  |  |  |  |
Forward sale price (in dollars per share) | $ 23.23 |  | $ 23.23 |  |  |  |  | $ 25.74688
Initial fair value (in dollars per share) | $ 0 |  | $ 0 |  |  |  |  |
Cash in exchange of physical delivery of shares on settlement | 109 |  | 109 |  |  |  |  |
Delivery of cash on settlement | 16.0 |  | 16.0 |  | 23.9 | 32.1 |  |
Underwriting discount included in delivery of cash | $ 5 |  | $ 5 |  |  |  |  |
Delivery of net shares on settlement | 588,000 |  | 588,000 |  | 1,000,000 | 1,300,000 |  |
Stock appreciation rights (SARs) | Common stock |  |  |  |  |  |  |  |
Antidilutive effect of HEI common stock |  |  |  |  |  |  |  |
Antidilutive effects of SARs shares that were not included in the computation of diluted EPS (in shares) |  |  |  | 164,000 |  |  |  |

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