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Derivatives - Interest Rate Risk (Details) - Derivatives designated as hedging instruments: - USD ($) | Mar. 31, 2018 | Aug. 31, 2017
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Interest rate swaps |  |
Notional Disclosures |  |
Notional amount of interest rate swaps | $ 500,000,000 |
May 2019 |  |
Notional Disclosures |  |
Notional amount of interest rate swaps | 100,000,000 |
May 2020 |  |
Notional Disclosures |  |
Notional amount of interest rate swaps | 100,000,000 |
March 2022 |  |
Notional Disclosures |  |
Notional amount of interest rate swaps | $ 300,000,000 | $ 300,000,000.0

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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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- Details
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