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Segment Information (Net Sales Relating To Segments) (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Revenue from External Customer [Line Items] |  |  |
Net sales | $ 3,802.1 | $ 3,808.7 | $ 3,705.4
Hardware & Home Improvement [Member] | Operating Segments [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Net sales | 1,355.7 | 1,377.7 | 1,276.1
Home And Personal Care [Member] | Operating Segments [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Net sales | 1,068.1 | 1,110.4 | 1,132.3
Global Pet Supplies [Member] | Operating Segments [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Net sales | 870.2 | 820.5 | 793.2
Home And Garden [Member] | Operating Segments [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Net sales | $ 508.1 | $ 500.1 | $ 503.8

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