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Income Taxes - Reconciliation of Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Reconciliation of Unrecognized Tax Benefits
Unrecognized tax benefits — beginning of year	$ 11.5	$ 12.2	$ 7.2
Additions for tax positions of the current year	0.9	1.5	1.9
Additions for tax positions taken in prior years	0.4	0.6	4.6
Settlements with tax authorities/statute lapses	(1.9)	(2.8)	(1.5)
Unrecognized tax benefits — end of year	$ 10.9	$ 11.5	$ 12.2

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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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
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- Definition

Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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