Goodwill Goodwill Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Goodwill Disclosure [Abstract]
Goodwill, Translation and Purchase Accounting Adjustments	$ 1.3	$ 0.0
Goodwill, Acquired During Period	$ 2.6