Organization and Principles of Consolidation Recent accounting pronouncements (Details) - 6 months ended Jun. 30, 2015 - USD ($) $ in Millions	Total
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Document Period End Date	Jun. 30, 2015
Parent Company [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Proceeds from Issuance of Debt	$ 6.4

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