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Significant Accounting Policies and Practices - Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 01, 2019 | Jun. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Impairment loss recognized on definite-lived tangible assets |  |  | $ 7.6 |  |  |
Debt issuance costs |  |  | (36.5) | $ (33.0) |  |
Expected returns liability |  |  | 23.1 | 19.2 |  |
Shipping and handling costs |  |  | 258.1 | 253.7 | $ 251.2 |
Advertising costs |  |  | $ 49.8 | 34.2 | 26.0 |
Percentage greater than the largest amount of recognized income tax positions which likely of being realized |  |  | 50.00% |  |  |
Exchange losses on foreign currency transactions |  |  | $ 10.7 | 41.2 | 7.1 |
Income from discontinued operations, net of tax |  |  | 14.0 | 682.5 | 445.0 |
Adjustment for error corrections |  |  | 1,415.8 | $ 1,728.9 | 1,589.6 | $ 1,946.9
Accounting Standards Update [Extensible List] |  |  |  | us-gaap:AccountingStandardsUpdate201602Member |  |
Operating lease assets |  |  | 103.8 |  |  |
Lease liabilities |  |  | $ 111.2 |  |  |
Operating leases |  |  | 4.68% |  |  |
Accumulated Earnings |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Income from discontinued operations, net of tax |  |  | $ 14.0 | $ 682.5 | 411.8 |
Adjustment for error corrections |  |  | 243.9 | 223.8 | (180.1) | (925.9)
Adjustment | Return-To-Provision Adjustments |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Income from discontinued operations, net of tax |  | $ 22.6 |  | 22.6 |  |
Adjustment for error corrections |  |  |  | 22.6 |  |
Accounting Standards Update 2016-02 |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201602Member |  |  |  |  |
Operating lease assets | $ 107.5 |  |  |  |  |
Lease liabilities | 113.0 |  |  |  |  |
Deferred taxes | $ 29.7 |  |  |  |  |
Operating leases | 4.60% |  |  |  |  |
Accounting Standards Update 2018-02 |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201802Member |  |  |  |  |
Reclassification from AOCI to retained earnings | $ 0.3 |  |  |  |  |
SB/RH |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Debt issuance costs |  |  | (36.5) | (31.5) |  |
Income from discontinued operations, net of tax |  |  | 14.0 | 682.5 | (24.0) |
Adjustment for error corrections |  |  | 1,265.2 | 1,434.7 | 1,611.7 | 1,835.4
Operating lease assets |  |  | 103.8 |  |  |
SB/RH | Accumulated Earnings |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Income from discontinued operations, net of tax |  |  | 14.0 | 682.5 | (24.0) |
Adjustment for error corrections |  |  | $ (614.2) | (414.7) | $ (235.5) | $ (42.8)
SB/RH | Adjustment | Return-To-Provision Adjustments |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Income from discontinued operations, net of tax |  |  |  | 22.6 |  |
Adjustment for error corrections |  |  |  | $ 22.6 |  |

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