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Income Taxes (Narrative) (Details) - USD ($) $ in Millions |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 14, 2019 | Jul. 13, 2018 | Jan. 01, 2018 | Dec. 31, 2017 | Dec. 22, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
U.S. Federal statutory income tax rate |  |  | 21.00% | 35.00% | 35.00% | 21.00% | 24.50% | 35.00% |
Tax benefit from reduction U.S. corporate income tax rate |  |  |  |  |  |  | $ (166.7) |  |
Provisional income tax expense from mandatory repatriation |  |  |  |  |  | $ (48.0) | 73.1 |  |
Mandatory repatriation tax payable period |  |  |  |  |  | 8 years |  |  |
First payment repatriation tax due | 2019-01 |  |  |  |  |  |  |  |
Repatriation tax liability | $ 25.1 |  |  |  |  | $ 22.9 |  |  |
Repatriation tax liability due and payable in the next 12 months, will be offset |  |  |  |  |  | 2.0 |  |  |
U.S. net operating losses |  |  |  |  |  | 454.6 |  |  |
Foreign tax credits |  |  |  |  |  | 70.7 |  |  |
Unrecognized tax benefits |  |  |  |  |  | 20.9 | 15.0 | $ 15.6 | $ 11.8
Undistributed foreign earnings were taxed in the U.S. |  |  |  |  |  | 500.6 |  |  |
Tax benefit for reducing deferred tax liability |  |  |  |  |  |  |  | 30.3 |
Amount of taxable earnings on repatriation |  |  |  |  |  |  |  | 2.3 |
Valuation allowance |  |  |  |  |  | 307.0 | 282.6 | 888.3 |
Undistributed earnings of foreign subsidiaries |  |  |  |  |  | 5.0 | 6.1 |  |
Impairment of goodwill |  |  |  |  |  | 116.0 |  |  |
U.S. federal net operating loss carryforwards |  |  |  |  |  | 1,491.1 |  |  |
Income tax benefit (expense) |  |  |  |  |  | (47.6) | 58.1 | 6.9 |
Income tax benefit (expense) |  |  |  |  |  | 2.7 | 1.0 | 0.6 |
U.S. state net operating loss carryforwards |  |  |  |  |  | 85.8 |  |  |
Federal and state tax expense |  |  |  |  |  | $ 95.9 |  |  |
NOLs expiration year |  |  |  |  |  | 2038 |  |  |
Foreign operating loss carryforwards |  |  |  |  |  | $ 119.4 |  |  |
Income tax benefit (expense) |  |  |  |  |  | 44.3 | 34.7 | 13.2 |
(Decrease) Increase valuation allowance, deferred tax asset |  | $ 365.3 |  |  |  | 24.4 | (605.7) |  |
Valuation allowance, net operating losses |  | $ 12.3 |  |  |  |  |  | 14.7 |
Unrecognized tax benefits that would impact effective tax rate |  |  |  |  |  | 20.9 | 15.0 |  |
Unrecognized tax benefits that would effect deferred tax assets |  |  |  |  |  | 1.9 |  |  |
Unrecognized tax benefits, income tax penalties and interest accrued |  |  |  |  |  | 2.7 | 2.8 |  |
Change in unrecognized tax benefits, income tax penalties and interest expense |  |  |  |  |  | 0.1 | 0.3 | 0.5 |
Goodwill impairment related to tax expense |  |  |  |  |  | 12.2 |  |  |
Income tax expense for one-time deemed mandatory repatriation |  |  |  |  |  | 48.0 |  |  |
Provisional tax |  |  |  |  |  | 166.7 |  |  |
GILTI [Member] |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Undistributed foreign earnings, untaxed |  |  |  |  |  | 40.8 |  |  |
Released [Member] |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Valuation allowance |  |  |  |  |  |  | 4.9 |  |
U.S. Net Deferred Tax Assets [Member] |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Valuation allowance |  |  |  |  |  | 273.5 | 247.3 | 862.2 |
(Decrease) Increase valuation allowance, deferred tax asset |  |  |  |  |  | 26.2 | (614.9) |  |
Foreign Net Deferred Tax Assets [Member] |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Valuation allowance |  |  |  |  |  | 33.5 | 35.3 | 26.1 |
(Decrease) Increase valuation allowance, deferred tax asset |  |  |  |  |  | (1.8) | 9.2 |  |
Federal Net Operating Losses [Member] |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Income tax benefit (expense) |  |  |  |  |  | 313.1 |  |  |
U.S. federal operating loss carryforwards expected to expire unused |  |  |  |  |  | 660.5 |  |  |
Tax benefit related to NOLs expire unused |  |  |  |  |  | 138.7 |  |  |
Valuation allowance, net operating losses |  |  |  |  |  | 36.7 |  |  |
U.S. State Net Operating Losses [Member] |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Valuation allowance |  |  |  |  |  |  | 59.5 |  |
Tax benefit related to NOLs expire unused |  |  |  |  |  | 16.7 |  |  |
Foreign Net Operating Losses [Member] |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Income tax benefit (expense) |  |  |  |  |  | $ 29.1 |  |  |
Operating loss carryforwards, expiration |  |  |  |  |  | Sep. 30, 2020 |  |  |
Tax benefit related to NOLs expire unused |  |  |  |  |  | $ 31.1 |  |  |
SB/RH [Member] |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Tax benefit from reduction U.S. corporate income tax rate |  |  |  |  |  |  | (181.7) |  |
Provisional income tax expense from mandatory repatriation |  |  |  |  |  | (48.0) | 73.1 |  |
Valuation allowance |  |  |  |  |  | 202.8 | 178.4 |  |
Impairment of goodwill |  |  |  |  |  | 116.0 |  |  |
Income tax benefit (expense) |  |  |  |  |  | (47.6) | 58.4 | 4.2 |
Income tax benefit (expense) |  |  |  |  |  | 2.7 | 1.0 | 0.6 |
Income tax benefit (expense) |  |  |  |  |  | 44.3 | $ 34.7 | $ 13.2 |
Goodwill impairment related to tax expense |  |  |  |  |  | 12.2 |  |  |
Income taxes payable |  |  |  |  |  | $ 211.1 |  |  |

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