Commitments and Contingencies - Purchase Commitments (Details) - USD ($) $ in Millions	Mar. 31, 2018	Sep. 30, 2017
Non-cancellable Contracts and Purchase Orders for Inventory
Other Commitments [Line Items]
Other Commitment	$ 163.7	$ 122.0

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

No definition available.

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