The number of units issued during the period pursuant to acquisitions.

No definition available.

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- Definition

Fees paid to an agent employed by a corporation or mutual fund to maintain shareholder records, including purchases, sales, and account balances. Also includes custodian fees incurred during an accounting period from an agent, bank, trust company, or other organization that holds and safeguards an individual's, mutual fund's, or investment company's assets for them. These fees will be billed back to the client and are a component of noninterest expense.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.14)

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- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

+ Details

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- Definition

The number of states the entity operates in as of the balance sheet date.

+ References

No definition available.

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- Definition

The percentage rate used to calculate dividend payments on preferred stock.

+ References

No definition available.

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- Definition

The cumulative amount of offering costs allocated to the preferred partners.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 272

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 5

-Subparagraph (SAB TOPIC 4.F)

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- Definition

The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

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- Definition

The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

+ References

No definition available.

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Organization and operations (Details) (USD $) In Millions, except Share data, unless otherwise specified	24 Months Ended	12 Months Ended		0 Months Ended
	Dec. 31, 2014	Dec. 31, 2012	Dec. 31, 2013	Jun. 10, 2013	Oct. 31, 2013	Jan. 31, 2014	May 31, 2014
Organization and operations
Number of properties	34,599us-gaap_NumberOfRealEstateProperties		23,268us-gaap_NumberOfRealEstateProperties
Number of states	22		22
Series A and Series B Preferred Shares
Organization and operations
Proceeds from offering before fees	$ 126.5
Offering costs	7.3
Series A Preferred Stock
Organization and operations
Offering costs					7.3
Sale of stock, number of shares issued	5,060,000
Preferred Shares dividend rate	5.00%
Series B Preferred Stock
Organization and operations
Proceeds from offering before fees	110.0
Offering costs	6.6		6.6			6.6
Sale of stock, number of shares issued	4,400,000
Preferred Shares dividend rate	5.00%
Series C Preferred Stock
Organization and operations
Proceeds from offering before fees	190.0
Offering costs	9.7						9.7
Sale of stock, number of shares issued	7,600,000
Preferred Shares dividend rate	5.50%
2012 Offering
Organization and operations
Proceeds from offering before fees		530.4
Fees associated with the sale of stock		40.9
2012 Offering \| Sponsor
Organization and operations
Proceeds from offering before fees		5.3
2013 Offering
Organization and operations
Proceeds from offering before fees			747.5
Fees associated with the sale of stock			44.0
IPO
Organization and operations
Proceeds from offering before fees			811.8
Fees associated with the sale of stock			42.0
2013 Concurrent Private Placements
Organization and operations
Proceeds from offering before fees			$ 75.0
Operating Partnership \| Series D Convertible Units
Organization and operations
Issuance of units (in shares)				4,375,000
Operating Partnership \| Series E Convertible Units
Organization and operations
Issuance of units (in shares)				4,375,000