Financial Instruments (Narrative) (Details) € in Millions |
6 Months Ended | 12 Months Ended | ||
---|---|---|---|---|
Mar. 31, 2019
USD ($)
|
Mar. 31, 2019
EUR (€)
|
Sep. 30, 2018
USD ($)
|
Sep. 30, 2018
EUR (€)
|
|
Derivative [Line Items] | ||||
Net liability position of derivatives with credit risk-related contingent features | $ 23,700,000 | $ 33,400,000 | ||
Collateral posted on liability positions with credit risk-related contingent features | 0 | |||
Collateral amount that counterparties would be required to post | $ 83,300,000 | 97,600,000 | ||
Forward Exchange Contracts | Cash Flow Hedges | ||||
Derivative [Line Items] | ||||
Maximum remaining maturity of foreign currency derivatives | 2 years 7 months 6 days | 2 years 7 months 6 days | ||
Foreign Currency Debt | Euro Denominated | ||||
Derivative [Line Items] | ||||
Notional amount included in designated foreign currency denominated debt | $ 1,021,300,000 | € 910.4 | $ 1,054,600,000 | € 908.8 |