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Income Taxes (Schedule Of Reconciliation Of Income Tax Expense) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
U.S. Statutory federal income tax expense $ (40.7) $ (8.8) $ (9.7)
Permanent items 3.7 7.6 4.8
Goodwill impairment 12.2    
Foreign statutory rate vs. U.S. statutory rate (10.3) 3.0 (32.8)
State income taxes, net of federal effect (14.2) (2.9) 1.2
Illinois state rate change     (3.4)
Tax reform act - U.S. rate change   (166.7)  
Global intangible low tax income inclusion 8.6    
Foreign dividend received deduction tax law change 95.9    
Tax reform act - mandatory repatriation (48.0) 73.1  
Residual tax on foreign earnings 1.5 5.9 (36.1)
Change in valuation allowance (29.9) (365.6) 77.1
Unrecognized tax expense (benefit) 6.2 (0.1) 3.9
Share based compensation adjustments 4.6 (5.5) (4.9)
Research and development tax credits (4.4) (1.9) (9.3)
UK Tax refund     (1.5)
Outside basis difference     (0.8)
Return to provision adjustments and other, net 7.7 (0.8) (0.3)
Income tax (benefit) expense (7.1) (462.7) (11.8)
SB/RH [Member]      
U.S. Statutory federal income tax expense (27.1) 31.9 60.8
Permanent items 3.8 (3.5) 0.8
Goodwill impairment 12.2    
Foreign statutory rate vs. U.S. statutory rate (10.3) 3.0 (32.8)
State income taxes, net of federal effect (11.1) (1.9) 1.3
Illinois state rate change     (3.4)
Tax reform act - U.S. rate change   (181.7)  
Global intangible low tax income inclusion 8.6    
Foreign dividend received deduction tax law change 95.9    
Tax reform act - mandatory repatriation (48.0) 73.1  
Residual tax on foreign earnings 1.5 5.9 (36.1)
Change in valuation allowance (29.9) (0.3) 18.1
Unrecognized tax expense (benefit) 6.2 (0.1) 3.9
Share based compensation adjustments 4.6 (0.5) (0.4)
Research and development tax credits (4.4) (1.9) (9.3)
UK Tax refund     (1.5)
Outside basis difference     (5.4)
Return to provision adjustments and other, net 8.7 (0.8) (4.6)
Income tax (benefit) expense $ 10.7 $ (76.8) $ (8.6)