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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
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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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- Definition Face amount or stated value per share of common stock. + References 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 + Details
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