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

No definition available.

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

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

+ References

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 55

-Paragraph 4J

-URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591551-111686

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- Definition

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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.6-04.16(a))

-URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e603758-122996

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 5

-Subparagraph (SAB TOPIC 4.F)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 16

-Subparagraph a, b

-Article 6

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.6-04.16(b))

-URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e603758-122996

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Shareholders' equity (Details 3) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
AH LLC
Class of Stock
Percentage of units outstanding	21.80%		21.80%
Operating Partnership \| Class A Units
Class of Stock
Units outstanding (in shares)	225,927,834		225,914,576
Income (loss) allocated to noncontrolling interest	$ 0.8	$ 0.8
Operating Partnership \| Class A Units \| AH LLC
Class of Stock
Percentage of units outstanding	6.40%		6.40%
Units owned (in shares)	14,440,670		14,440,670
Operating Partnership \| Series C Convertible Units
Class of Stock
Units owned (in shares)	31,085,974		31,085,974
Income (loss) allocated to noncontrolling interest	4.7	4.5
Operating Partnership \| Series C Convertible Units \| AH LLC
Class of Stock
Units owned (in shares)	31,085,974		31,085,974
Operating Partnership \| Series D Convertible Units \| AH LLC
Class of Stock
Units owned (in shares)	4,375,000		4,375,000
Certain consolidated subsidiaries with noncontrolling interest
Class of Stock
Income (loss) allocated to noncontrolling interest		0.1
Certain consolidated subsidiaries with noncontrolling interest \| Operating Partnership
Class of Stock
Income (loss) allocated to noncontrolling interest	$ 0.1