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Debt (Narrative) (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Sep. 30, 2018
Debt Instrument [Line Items] |  |
Short-term Debt | $ 75.0 | $ 0.0
Two Point Two Percentage Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Stated Interest Rate | 2.20% |
Debt Instrument, Face Amount | $ 500.0 | 500.0
Two Point Two Percentage Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Stated Interest Rate | 3.75% |
Debt Instrument, Face Amount | $ 500.0 | 500.0
PointThreeSevenTwoPercentageYenDenominatedSeniorNotes [Member] |  |
Debt Instrument [Line Items] |  |
Stated Interest Rate | 0.372% |
Debt Instrument, Face Amount | $ 767.4 | 748.4
Three Point One Percentage Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Stated Interest Rate | 3.50% |
Debt Instrument, Face Amount | $ 600.0 | $ 600.0
Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt covenant compliance | The indentures under which the above notes were issued require us to maintain compliance with certain covenants, including limits on future liens and sale and leaseback transactions on certain material properties. As of March 31, 2019, we were in compliance with all applicable covenants. |

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- Definition States whether the entity was in compliance with the debt covenants throughout the reporting period, and describes facts and circumstances of any compliance failure. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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