Receivables From Customers, Net and Notes Receivable, Net Receivables from Customers, Net and Notes Receivables, Net - Bad Debt Expense and Recoveries (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Provision for Doubtful Accounts	$ 0.2	$ 1.3	$ 1.3	$ 3.8
Other Segments [Member]
Provision for Doubtful Accounts			$ 1.0