Amount classified as assets attributable to disposal group held for sale or disposed of.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Business Segment and Geographic Information (Reconciliation of Assets) (Details) - USD ($) $ in Millions	Oct. 01, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Total assets	$ 19,204.5	$ 19,178.3	$ 18,467.2	$ 18,028.6
Segment Total
Segment Reporting Information [Line Items]
Total assets		19,178.3	18,457.0	16,060.1
Discontinued Operations \| Segment Reconciling Items
Segment Reporting Information [Line Items]
Assets of discontinued operations		$ 0.0	$ 10.2	$ 1,968.5