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Derivative Instruments and Hedging Activities (Forward Interest Rate Swap Agreements) (Details) - Interest rate swap agreements - USD ($) $ in Millions | Sep. 30, 2018 | Jul. 31, 2018 | Jun. 25, 2018 | May 23, 2018 | Mar. 31, 2018
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Derivative [Line Items] |  |  |  |  |
Notional amount | $ 1,500.0 | $ 300.0 | $ 200.0 | $ 1,000.0 | $ 0.0
Fixed Rate Paid |  | 2.885% | 2.723% | 2.915% |

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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 Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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