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Acquisitions - Components of Net Deferred Tax Assets (Detail) (USD $) In Millions, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013
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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

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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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