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Taxes on Income - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Income Tax Disclosure [Abstract]      
Tax benefit (shortfall) associated with stock-based compensation plans $ (8.7) $ (5.9) $ 10.9
Reduced rates on income tax expense, amount $ 28.8 $ 34.2 $ 68.3
Reduced rates on income tax expense, income tax benefits per diluted share $ 0.05 $ 0.06 $ 0.11
Income Tax Examination [Line Items]      
Valuation allowance $ 0.6 $ (9.4)  
Cumulative undistributed foreign earnings 9,000.0    
Accrued interest on uncertain tax positions 10.4 9.6  
Unrecognized Tax Benefits, Interest on Income Taxes Expense 1.6 $ (1.3) $ (6.6)
Estimated decrease in unrecognized tax benefits within the next twelve months 12.6    
Foreign Tax Authority [Member]      
Income Tax Examination [Line Items]      
Operating loss carry-forwards 131.4    
State [Member]      
Income Tax Examination [Line Items]      
Operating loss carry-forwards 32.2    
Expire between 2019 and 2038 [Member] | Foreign Tax Authority [Member]      
Income Tax Examination [Line Items]      
Operating loss carry-forwards $ 62.4