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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Initial Public Offering
Issuance of common units, tax impact		$ 148.0
Underwritten Offering
Issuance of common units, tax impact		96.0
Private Placement
Issuance of common units, tax impact		15.2
Secondary Offering
Issuance of common units, tax impact		$ 88.5
Second Underwritten Offering
Issuance of common units, tax impact	$ 39.4

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Stock Issued During Period, Value, New Issues, Tax (Benefit) Expense

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- Definition

Face amount or stated value per share of common stock.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 30
-Article 5

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