Accounts receivable (Tables)

12 Months Ended

Sep. 30, 2015

Accounts Receivable [Abstract]

Schedule of allowance for doubtful accounts

Accounts Receivable (Allowance for Doubtful Accounts)				Additions
				Charged to
(In millions)		Beginning balance		Costs / expenses		Other accounts		Deductions		Ending balance
For the year ended September 30,
2015	$	2.4	$	0.2	$	-	$	1.2	$	1.4
2014		1.6		1.0		-		0.2		2.4
2013	$	1.4	$	0.8	$	-	$	0.6	$	1.6