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Derivative Instruments and Hedging Activities Derivative Instruments and Hedging Activities - Fixed Rate Bonds (Details) $ in Millions | Jun. 30, 2017 Swap | Sep. 30, 2016 Swap | Jun. 30, 2014 USD ($) Swap
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Derivative Instruments and Hedging Activities - Fixed Rate Bonds [Line Items] |  |  |
Number of Interest Rate Derivatives Held | 0 | 8 |
2.6% due 2017 | Interest Rate Swaps |  |  |
Derivative Instruments and Hedging Activities - Fixed Rate Bonds [Line Items] |  |  |
Number of Interest Rate Derivatives Held |  |  | 4
Notional amount | $ |  |  | $ 400
Debt Instrument, Interest Rate, Stated Percentage |  |  | 2.60%
1.4% due 2018 | Interest Rate Swaps |  |  |
Derivative Instruments and Hedging Activities - Fixed Rate Bonds [Line Items] |  |  |
Number of Interest Rate Derivatives Held |  |  | 3
Notional amount | $ |  |  | $ 300
Debt Instrument, Interest Rate, Stated Percentage |  |  | 1.40%
7.125% due 2017 | Interest Rate Swaps |  |  |
Derivative Instruments and Hedging Activities - Fixed Rate Bonds [Line Items] |  |  |
Number of Interest Rate Derivatives Held |  |  | 1
Notional amount | $ |  |  | $ 150
Debt Instrument, Interest Rate, Stated Percentage |  |  | 7.125%

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition [Line Items] for Derivative Instruments and Hedging Activities - Fixed Rate Bonds [Table] + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Number of interest rate derivative instruments held by the entity at the reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5579245-113959 + Details
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