Goodwill Goodwill Adjustments (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, Translation and Purchase Accounting Adjustments	$ 0.0	$ 1.2
Goodwill, Acquired During Period	$ 0.2