Accounts Receivable Facility (Narrative) (Details) - Accounts receivable sales agreement - USD ($) $ in Millions	3 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Sep. 30, 2019
Transfer of Financial Assets Accounted for as Sales [Line Items]
Transfer of accounts receivable, quarter to date sold	$ 181.7	$ 213.9
Transfer of accounts receivable, sales amount derecognized	67.5		$ 74.9
Loss on sale of accounts receivable	$ 0.5	$ 0.6

Amount of derecognized financial assets from transactions which comprise an initial transfer and an agreement entered into in contemplation of the initial transfer resulting in retention of substantially all of the exposure to the economic return throughout the term of the transaction, at the date of derecognition.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4D
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118948506&loc=SL51823488-111719

Name:	us-gaap_TransferOfFinancialAssetsAccountedForAsSalesAmountDerecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant