Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	Mar. 31, 2016	Jun. 30, 2015
Adjustments for new accounting pronouncements [Line Items]
Expected reduction in debt liabilities		$ (1,948.6)
Scenario, Forecast [Member] \| ASU No. 2015-03 [Member]
Adjustments for new accounting pronouncements [Line Items]
Expected reduction in debt issuance cost asset	$ 11.0
Expected reduction in debt liabilities	$ 11.0

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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 210.5-02.17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_UnamortizedDebtIssuanceExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant