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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

X

- 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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X

- 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.

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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.

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