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Shareholders' equity (Details 2) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended				3 Months Ended				3 Months Ended					3 Months Ended
	Mar. 31, 2014 3.5% Convertible Perpetual Preferred Units	Jun. 14, 2013 3.5% Convertible Perpetual Preferred Units	Mar. 31, 2014 Sponsor	Dec. 31, 2013 Sponsor	Mar. 31, 2014 Operating Partnership Class A Units	Dec. 31, 2013 Operating Partnership Class A Units	Mar. 31, 2014 Operating Partnership Class A Units Sponsor	Dec. 31, 2013 Operating Partnership Class A Units Sponsor	Mar. 31, 2014 Operating Partnership Series C Convertible Units	Mar. 31, 2014 Operating Partnership Series C Convertible Units Sponsor	Dec. 31, 2013 Operating Partnership Series C Convertible Units Sponsor	Mar. 31, 2014 Operating Partnership Series D Convertible Units Sponsor	Dec. 31, 2013 Operating Partnership Series D Convertible Units Sponsor	Mar. 31, 2014 Certain consolidated subsidiaries with noncontrolling interest
Class of Stock
Percentage of units outstanding			24.60%	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)					199,291,586	199,291,586
Income (loss) allocated to noncontrolling interest	$ 0.1				$ 0.8				$ 4.5					$ 0.1
Rate of Preferred units	3.50%	3.50%

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Dividend Rate For Preferred Units.

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X

- Definition

The number of units of the operating partnership owned by the noncontrolling interest, a related party.

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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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Amount of Net Income (Loss) attributable to noncontrolling interest.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 1A

-URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684



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The number of each class of partnership units outstanding at the balance sheet date. Units represent shares of ownership of the general, limited, and preferred partners.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 210

-Section S99

-Paragraph 1

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