Share Based Compensation (Summary Of Share Based Compensation Expense) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Share based compensation			$ 21.8	$ 1.4
Spectrum Equity Plan [Member]
Share based compensation	$ 15.9	$ (3.1)	21.8	1.4
SB/RH [Member]
Share based compensation			21.1
SB/RH [Member] \| Spectrum Equity Plan [Member]
Share based compensation	$ 15.5	$ (3.8)	$ 21.1	$ (0.3)

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration