Other Required Disclosures - Components of Receivables, Net (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade accounts receivable	$ 530.4	$ 357.2
Contingent purchase price reduction receivable (Note 3)	41.0	41.0
Other receivables	50.5	38.1
Total receivables	621.9	436.3
Less: Allowance for doubtful trade accounts receivable	28.5	21.9
Total receivables, net	593.4	414.4
Consumer Products Trade Accounts Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade accounts receivable	508.5	357.2
Oil and Gas Trade Accounts Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade accounts receivable	$ 21.9