Intangible Assets Intangible Assets Acquired (Details) $ in Millions	6 Months Ended
Mar. 31, 2019 USD ($)
Intangible Assets Acquired [Abstract]
Indefinite-lived Intangible Assets Acquired	$ 2.7

Amount of increase in assets, excluding financial assets and goodwill, lacking physical substance with an indefinite life, from an acquisition.

No definition available.

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