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Earnings per share and shareholders' equity (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Mar. 20, 2015 | 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 |  | $ 0.62 |  |  |  |  |
Earnings Per Share, Diluted |  | 0.31 |  | 0.62 |  |  |  |  |
Undistributed earnings, Basic (dollars per share) |  | 0.10 |  | 0.24 |  |  |  |  |
Earnings Per Share, Diluted, Undistributed |  | 0.10 |  | 0.23 |  |  |  |  |
Earnings per share, Basic (in dollars per share) | $ 0.33 | 0.41 | $ 0.63 | 0.86 |  |  |  |  |
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
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 |  |  |  |  | 4,700,000 | 1,000,000 | 1,300,000 |  |
Delivery of cash on settlement |  |  |  |  | $ 104.5 | $ 23.9 | $ 32.1 |  |
Underwriting discount |  |  |  |  | $ 4.7 | $ 1.0 | $ 1.3 |  |
Diluted earnings per common share (in dollars per share) | $ 0.33 | $ 0.41 | $ 0.63 | $ 0.85 |  |  |  |  |
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) |  |  | 0 | 102,000 |  |  |  |  |

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