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Shareholders' equity (Details 2) (USD $) In Millions, except Share data, unless otherwise specified |  |  | 3 Months Ended | 9 Months Ended |  |  |  | 3 Months Ended | 9 Months Ended |  |  |  |  | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended
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Sep. 30, 2014 Sponsor | Dec. 31, 2013 Sponsor | Sep. 30, 2014 Operating Partnership Class A Units | Sep. 30, 2014 Operating Partnership Class A Units | Dec. 31, 2013 Operating Partnership Class A Units | Sep. 30, 2014 Operating Partnership Class A Units Sponsor | Dec. 31, 2013 Operating Partnership Class A Units Sponsor | Sep. 30, 2014 Operating Partnership Series C Convertible Units | Sep. 30, 2013 Operating Partnership Series C Convertible Units | Sep. 30, 2014 Operating Partnership Series C Convertible Units | Sep. 30, 2013 Operating Partnership Series C Convertible Units | Sep. 30, 2014 Operating Partnership Series C Convertible Units Sponsor | Dec. 31, 2013 Operating Partnership Series C Convertible Units Sponsor | Sep. 30, 2014 Operating Partnership Series D Convertible Units Sponsor | Dec. 31, 2013 Operating Partnership Series D Convertible Units Sponsor | Sep. 30, 2014 Certain consolidated subsidiaries with noncontrolling interest | Sep. 30, 2013 Certain consolidated subsidiaries with noncontrolling interest | Sep. 30, 2014 Certain consolidated subsidiaries with noncontrolling interest | Sep. 30, 2013 Certain consolidated subsidiaries with noncontrolling interest | Sep. 30, 2013 Certain consolidated subsidiaries with noncontrolling interest Preferred Units | Sep. 30, 2013 Certain consolidated subsidiaries with noncontrolling interest Preferred Units | Sep. 30, 2013 Certain consolidated subsidiaries with noncontrolling interest Class A Units | Sep. 30, 2013 Certain consolidated subsidiaries with noncontrolling interest Class A Units
Class of Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of units outstanding | 21.70% | 24.60% |  |  |  | 6.10% | 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) |  |  | 225,261,198 | 225,261,198 | 199,291,586 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) allocated to noncontrolling interest |  |  | $ (1.1) | $ (2.5) |  |  |  | $ 4.7 | $ 4.7 | $ 13.9 | $ 10.2 |  |  |  |  | $ (0.2) | $ (0.2) | $ (0.2) | $ (0.2) | $ 0 | $ 0.2 | $ (0.7) | $ (0.8)

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