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Acquisitions - Armored AutoGroup acquisition (Detail) - USD ($) $ in Millions | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
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Business Acquisition [Line Items] |  |  |
Goodwill (Note 11) | $ 2,277.1 | $ 2,133.3 | $ 2,138.9

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