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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2015 | Oct. 01, 2015 | Sep. 30, 2015
Income Taxes [Line Items] |  |  |  |  |  |  |  |
U.S. Federal statutory income tax rate |  | 24.50% |  | 35.00% | 35.00% |  |  |
Tax benefit from reduction U.S. corporate income tax rate |  | $ (166.7) |  |  |  |  |  |
Estimated undistributed foreign earnings and profits |  | 552.2 |  |  |  |  |  |
Provisional income tax expense from mandatory repatriation |  | 73.1 |  |  |  |  |  |
Interest expense nondeductible |  | 89.9 |  |  |  |  |  |
Unrecognized tax benefits |  | 15.0 |  | $ 15.6 | $ 11.8 |  |  | $ 8.5
Valuation allowance |  | 282.6 |  | 946.4 |  |  |  |
Undistributed earnings of foreign subsidiaries |  | 3.6 |  |  | 30.9 |  |  |
Tax benefit through undistributed foreign earnings |  |  |  | 30.3 |  |  |  |
Tax expense through undistributed foreign earnings |  | 2.0 |  | 2.3 | 1.4 |  |  |
Undistributed foreign earnings remaining untaxed |  | 15.6 |  |  |  |  |  |
Income tax benefit (expense) |  | 58.1 |  | 6.9 |  |  |  |
Income tax benefit (expense) |  | 1.0 |  | 0.6 | 4.4 |  |  |
Capital loss carryforwards |  | 442.2 |  |  |  |  |  |
Federal and state tax benefit |  | 104.1 |  |  |  |  |  |
Additional federal and state operating loss carryforwards |  | $ 4.3 |  |  |  |  |  |
NOLs expiration year |  | 2038 |  |  |  |  |  |
Income tax benefit (expense) |  | $ 34.7 |  | 13.2 | 32.0 |  |  |
(Decrease) Increase valuation allowance, deferred tax asset |  | (605.7) |  | 402.7 |  |  |  |
Unrecognized tax benefits, income tax penalties and interest accrued |  | 2.8 |  | 2.5 |  |  |  |
Change in unrecognized tax benefits, income tax penalties and interest expense |  | 0.3 |  | 0.5 | (0.5) |  |  |
Reduced unrecognized tax benefits |  | 1.9 |  |  |  |  |  |
Tax Reform Act [Member] |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
U.S. Federal statutory income tax rate | 21.00% |  | 35.00% |  |  |  |  |
Undistributed earnings of foreign subsidiaries |  | 552.2 |  |  |  |  |  |
Tax Reform Act - Other Current Liabilities [Member] |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Provisional income tax expense from mandatory repatriation |  | 5.9 |  |  |  |  |  |
Tax Reform Act - Other Long-Term Liabilities [Member] |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Provisional income tax expense from mandatory repatriation |  | $ 67.2 |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Mandatory repatriation tax payable period |  | 8 years |  |  |  |  |  |
U.S. Net Deferred Tax Assets [Member] |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Valuation allowance |  | $ 247.3 |  | 862.2 | 203.7 |  |  |
(Decrease) Increase valuation allowance, deferred tax asset |  | (614.9) |  | 394.2 |  |  |  |
U.S. Net Deferred Tax Assets [Member] | Released [Member] |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Valuation allowance |  | 365.3 |  |  | 111.1 |  |  |
Foreign Net Deferred Tax Assets [Member] |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Valuation allowance |  | 35.3 |  | 26.1 | $ 17.6 |  |  |
(Decrease) Increase valuation allowance, deferred tax asset |  | 9.2 |  | 8.5 |  |  |  |
Federal Net Operating Losses [Member] |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Income tax benefit (expense) |  | 509.7 |  |  |  |  |  |
Federal Net Operating Losses [Member] | Russell Hobbs U.S. Federal And State NOLs [Member] |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
U.S. federal net operating loss carryforwards |  | 661.0 |  |  |  |  |  |
Income tax benefit (expense) |  | 138.8 |  |  |  |  |  |
U.S. State Net Operating Losses [Member] |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
U.S. federal net operating loss carryforwards |  | 2,427.2 |  |  |  |  |  |
Income tax benefit (expense) |  | 108.3 |  | $ 14.7 |  |  |  |
Valuation allowance, net operating losses |  | 61.4 |  |  |  |  |  |
U.S. State Net Operating Losses [Member] | Russell Hobbs U.S. Federal And State NOLs [Member] |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Income tax benefit (expense) |  | 16.7 |  |  |  |  |  |
Foreign Net Operating Losses [Member] |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Foreign operating loss carryforwards |  | 122.4 |  |  |  |  |  |
Income tax benefit (expense) |  | $ 30.4 |  |  |  |  |  |
Operating loss carryforwards, expiration |  | Sep. 30, 2019 |  |  |  |  |  |
Tax benefit related to NOLs expire unused |  | $ 26.2 |  |  |  |  |  |
U.S. Federal And State Capital Losses [Member] | Released [Member] |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Valuation allowance |  | 4.9 |  |  |  |  |  |
Tax Year 2019 [Member] | Tax Reform Act [Member] |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Limits on deducting compensation, including performance-base compensation |  | 1.0 |  |  |  |  |  |
Internal Revenue Service (IRS) [Member] | Ruling [Member] |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
U.S. state net operating loss carryforwards |  |  |  |  |  | $ 87.8 |  |
Internal Revenue Service (IRS) [Member] | U.S. Net Deferred Tax Assets [Member] | Ruling [Member] |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Valuation allowance |  |  |  |  |  | $ 16.2 |  |
Spectrum Merger [Member] | U.S. State Net Operating Losses [Member] |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Income tax benefit (expense) |  | $ 12.3 |  |  |  |  |  |
Accounting Standards Update 2016-09 [Member] | U.S. Net Deferred Tax Assets [Member] |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Valuation allowance |  |  |  |  |  |  | $ 25.1 |

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