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Segments - Reconciliation of Assets from Segment to Consolidated (Details) - USD ($) $ in Millions	Jun. 30, 2019	Sep. 30, 2018
Segment Reporting, Asset Reconciling Item [Line Items]
Goodwill and other intangible assets	$ 2,984.6	$ 476.8
Assets held for sale	807.6	0.0
Total assets	5,577.7	3,178.8
Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Tangible assets	1,641.4	1,355.7
Corporate
Segment Reporting, Asset Reconciling Item [Line Items]
Tangible assets	144.1	1,346.3
Americas | Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Tangible assets	982.1	504.2
International | Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Tangible assets	$ 659.3	$ 851.5

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