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Goodwill and Intangible Assets - Components of Company's Intangible Assets (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2014 | Sep. 30, 2013 | Jun. 30, 2013
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Goodwill and Intangible Assets Disclosure [Abstract] |  |  |
Goodwill (not subject to amortization) | $ 2,885.1 | $ 2,871.0 | $ 2,834.0
Intangible assets: |  |  |
Customer relationships, noncompete agreements and other | 717.3 | 706.4 | 692.6
Trademarks and tradenames (not subject to amortization) | 132.0 | 131.3 | 128.4
Gross carrying amount | 849.3 | 837.7 | 821.0
Accumulated amortization | (259.0) | (227.1) | (212.4)
Intangible assets, net | $ 590.3 | $ 610.6 | $ 608.6

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- Definition Gross carrying amount before accumulated amortization as of the balance sheet date to an asset acquired in a business combination representing a favorable existing relationship with customers having a finite beneficial life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for the rights acquired through registration of a trademark to gain or protect exclusive use of a business name, symbol or other device or style for a projected indefinite period of benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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