Fair Value (Fair Value Liabilities Measured on Recurring Basis Unobservable Input Reconciliation) (Details) $ in Millions	12 Months Ended
	Sep. 30, 2016 USD ($)
Fair Value, Liabilities [Roll Forward]
Contingent consideration, ending balance	$ 7.4
Fair Value, Measurements, Recurring [Member]
Fair Value, Liabilities [Roll Forward]
Purchase obligation, beginning balance	75.4
Foreign currency derivative, beginning balance	2.8
Contingent consideration, beginning balance	0.5
Purchase obligation, ending balance	0.0
Foreign currency derivative, ending balance	0.0
Contingent consideration, ending balance	7.9
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Liabilities [Roll Forward]
Purchase obligation, beginning balance	75.4
Foreign currency derivative, beginning balance	2.8
Contingent consideration, beginning balance	0.5
Purchase obligation, ending balance	0.0
Foreign currency derivative, ending balance	0.0
Contingent consideration, ending balance	7.9
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Obligations [Member]
Fair Value, Liabilities [Roll Forward]
Purchase obligation, beginning balance	75.4
Changes in fair value included in earnings	0.0
Decreases of Level 3 liabilities	0.0
Purchase obligation, ending balance	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3	(75.4)
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Derivative [Member]
Fair Value, Liabilities [Roll Forward]
Foreign currency derivative, beginning balance	2.8
Changes in fair value included in earnings	(2.8)
Decreases of Level 3 liabilities	0.0
Foreign currency derivative, ending balance	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3	0.0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | contingent consideration classified as liability [Member]
Fair Value, Liabilities [Roll Forward]
Contingent consideration, beginning balance	0.5
Changes in fair value included in earnings	0.0
Decreases of Level 3 liabilities	7.4
Contingent consideration, ending balance	7.9
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3	$ 0.0