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Other (Income) Expense, Net - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2014
Components of Other Income (Expense) [Line Items]
Litigation related defense costs	$ 12.7us-gaap_LitigationSettlementExpense	$ 13.2us-gaap_LitigationSettlementExpense	$ 30.1us-gaap_LitigationSettlementExpense
Employee separation costs			7.5us-gaap_SeveranceCosts1
Productivity initiative costs
Components of Other Income (Expense) [Line Items]
Employee separation costs			$ 1.7

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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