Acquisitions - Components of Net Deferred Tax Assets (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Business Acquisition [Line Items]
Deferred tax assets,net	$ 186.7	$ 293.4
Deferred Tax Liabilities, Net	1,299.5	1,120.4
Deferred Tax Assets, Net	$ 952.9	$ 921.2