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Income Taxes (Schedule Of Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Income Taxes [Abstract] |  |  |
Unrecognized tax benefits, beginning of year | $ 15.6 | $ 11.8 | $ 8.5
Gross increase - tax positions in prior period | 0.9 | 3.4 | 3.2
Gross decrease - tax positions in prior period | (3.3) | (0.2) | (0.3)
Gross increase - tax positions in current period | 2.4 | 0.9 | 1.1
Settlements | (0.4) |  | (0.7)
Lapse of statutes of limitations | (0.2) | (0.3) |
Unrecognized tax benefits, end of year | $ 15.0 | $ 15.6 | $ 11.8

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=84176650&loc=SL37586934-109318 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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