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Derivative Instruments and Hedging Activities (Forward Foreign Exchange Contracts) (Details) - Forward exchange contracts £ in Millions, $ in Millions, $ in Millions, $ in Millions | Sep. 30, 2018 USD ($) | Sep. 30, 2018 AUD ($) | Sep. 30, 2018 CAD ($) | Sep. 30, 2018 GBP (£)
--- | --- | --- | --- | ---
British Pounds Sterling |  |  |  |
Derivative [Line Items] |  |  |  |
Foreign Currency Amount | £ |  |  |  | £ 5.1
US Dollar Amount | $ 7.1 |  |  |
Weighted average exchange rate per $1 USD | 0.72 | 0.72 | 0.72 | 0.72
Canada, Dollars |  |  |  |
Derivative [Line Items] |  |  |  |
Foreign Currency Amount |  |  | $ 25.8 |
US Dollar Amount | $ 20.4 |  |  |
Weighted average exchange rate per $1 USD | 1.27 | 1.27 | 1.27 | 1.27
Australia, Dollars |  |  |  |
Derivative [Line Items] |  |  |  |
Foreign Currency Amount |  | $ 5.1 |  |
US Dollar Amount | $ 3.9 |  |  |
Weighted average exchange rate per $1 USD | 1.29 | 1.29 | 1.29 | 1.29

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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 The amount of foreign currency that the entity has contractually agreed, or for which it has the option, to buy or sell with respect to the contract being described. + 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 Average contractual rate at which a foreign currency can be purchased or sold. + References No definition available. + Details
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