Receivables, net - Schedule of Receivables (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade accounts receivable	$ 508.6	$ 535.4
Less: Allowance for doubtful trade accounts receivable	48.6	37.4	21.9	14.1
Total trade accounts receivable, net	460.0	498.0
Contingent purchase price reduction receivable (Note 4)	41.5	41.0
Other receivables	83.6	72.3
Total receivables, net	585.1	611.3
Consumer Products Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade accounts receivable	487.7	518.7
Total receivables, net	515.3	546.9
Energy Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade accounts receivable	20.3	16.7
Total receivables, net	23.7	22.2
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade accounts receivable	$ 0.6	$ 0