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Shareholders' equity (Details 2) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended |  |  |  | 3 Months Ended | 6 Months Ended |  |  |  | 3 Months Ended | 6 Months Ended |  |  |  |  | 3 Months Ended | 6 Months Ended
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Jun. 30, 2013 3.5% Convertible Perpetual Preferred Units | Jun. 30, 2013 3.5% Convertible Perpetual Preferred Units | Jun. 14, 2013 3.5% Convertible Perpetual Preferred Units | Jun. 30, 2014 Sponsor | Dec. 31, 2013 Sponsor | Jun. 30, 2014 Operating Partnership Class A Units | Jun. 30, 2014 Operating Partnership Class A Units | Dec. 31, 2013 Operating Partnership Class A Units | Jun. 30, 2014 Operating Partnership Class A Units Sponsor | Dec. 31, 2013 Operating Partnership Class A Units Sponsor | Jun. 30, 2014 Operating Partnership Series C Convertible Units | Jun. 30, 2013 Operating Partnership Series C Convertible Units | Jun. 30, 2014 Operating Partnership Series C Convertible Units | Jun. 30, 2013 Operating Partnership Series C Convertible Units | Jun. 30, 2014 Operating Partnership Series C Convertible Units Sponsor | Dec. 31, 2013 Operating Partnership Series C Convertible Units Sponsor | Jun. 30, 2014 Operating Partnership Series D Convertible Units Sponsor | Dec. 31, 2013 Operating Partnership Series D Convertible Units Sponsor | Jun. 30, 2014 Certain consolidated subsidiaries with noncontrolling interest | Jun. 30, 2014 Certain consolidated subsidiaries with noncontrolling interest
Class of Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of units outstanding |  |  |  | 23.90% | 24.60% |  |  |  | 6.90% | 6.90% |  |  |  |  |  |  |  |  |  |
Units owned (in shares) |  |  |  |  |  |  |  |  | 13,787,292 | 13,787,292 |  |  |  |  | 31,085,974 | 31,085,974 | 4,375,000 | 4,375,000 |  |
Units outstanding (in shares) |  |  |  |  |  | 199,320,336 | 199,320,336 | 199,320,336 |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) allocated to noncontrolling interest | $ 0.10 | $ 0.20 |  |  |  | $ (0.60) | $ (1.30) |  |  |  | $ 4.70 | $ 4.70 | $ 9.20 | $ 5.50 |  |  |  |  | $ 0.07 | $ (0.02)
Rate of Preferred units | 3.50% | 3.50% | 3.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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