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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