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Financial Instruments (Schedule of Gain/Loss Related to Derivative Instruments) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Derivative [Line Items]      
Net gain (loss) recognized in OCI (effective portion) $ 45.9 $ (12.6) $ 13.7
Designated as Hedging Instrument | Cash Flow Hedges      
Derivative [Line Items]      
Net gain (loss) recognized in OCI (effective portion) 45.9 (12.6)  
Designated as Hedging Instrument | Cash Flow Hedges | Sales/Cost of Sales      
Derivative [Line Items]      
Net (gain) loss reclassified from OCI (effective portion) 7.1 18.3  
Designated as Hedging Instrument | Cash Flow Hedges | Other Income (Expense)      
Derivative [Line Items]      
Net (gain) loss reclassified from OCI (effective portion) (41.6) 6.7  
Net (gain) loss reclassified from OCI to other income (expense), net (ineffective portion) (1.0) (1.6)  
Designated as Hedging Instrument | Cash Flow Hedges | Interest Expense      
Derivative [Line Items]      
Net (gain) loss reclassified from OCI (effective portion) 5.1 0.8  
Designated as Hedging Instrument | Fair Value Hedges | Interest Expense      
Derivative [Line Items]      
Net gain (loss) recognized in other income (expense) [1] (10.1) (14.7)  
Designated as Hedging Instrument | Net Investment Hedges      
Derivative [Line Items]      
Net gain (loss) recognized in OCI 20.6 (59.5)  
Not Designated as Hedging Instrument | Other Income (Expense)      
Derivative [Line Items]      
Net gain (loss) recognized in other income (expense) [2] (4.8) 1.7  
Forward Exchange Contracts | Designated as Hedging Instrument | Cash Flow Hedges      
Derivative [Line Items]      
Net gain (loss) recognized in OCI (effective portion) 2.4 0.3  
Forward Exchange Contracts | Designated as Hedging Instrument | Cash Flow Hedges | Sales/Cost of Sales      
Derivative [Line Items]      
Net (gain) loss reclassified from OCI (effective portion) 7.1 18.3  
Forward Exchange Contracts | Designated as Hedging Instrument | Cash Flow Hedges | Other Income (Expense)      
Derivative [Line Items]      
Net (gain) loss reclassified from OCI (effective portion) (7.8) (3.8)  
Net (gain) loss reclassified from OCI to other income (expense), net (ineffective portion) (0.5) (1.6)  
Forward Exchange Contracts | Designated as Hedging Instrument | Cash Flow Hedges | Interest Expense      
Derivative [Line Items]      
Net (gain) loss reclassified from OCI (effective portion) 1.2 (2.1)  
Forward Exchange Contracts | Designated as Hedging Instrument | Fair Value Hedges | Interest Expense      
Derivative [Line Items]      
Net gain (loss) recognized in other income (expense) [1] 0.0 0.0  
Forward Exchange Contracts | Designated as Hedging Instrument | Net Investment Hedges      
Derivative [Line Items]      
Net gain (loss) recognized in OCI (0.6) (11.1)  
Forward Exchange Contracts | Not Designated as Hedging Instrument | Other Income (Expense)      
Derivative [Line Items]      
Net gain (loss) recognized in other income (expense) [2] (4.0) 4.1  
Foreign Currency Debt | Designated as Hedging Instrument | Net Investment Hedges      
Derivative [Line Items]      
Net gain (loss) recognized in OCI 10.2 (32.8)  
Other Contracts | Designated as Hedging Instrument | Cash Flow Hedges      
Derivative [Line Items]      
Net gain (loss) recognized in OCI (effective portion) [3] 43.5 (12.9)  
Other Contracts | Designated as Hedging Instrument | Cash Flow Hedges | Sales/Cost of Sales      
Derivative [Line Items]      
Net (gain) loss reclassified from OCI (effective portion) [3] 0.0 0.0  
Other Contracts | Designated as Hedging Instrument | Cash Flow Hedges | Other Income (Expense)      
Derivative [Line Items]      
Net (gain) loss reclassified from OCI (effective portion) [3] (33.8) 10.5  
Net (gain) loss reclassified from OCI to other income (expense), net (ineffective portion) [3] (0.5) 0.0  
Other Contracts | Designated as Hedging Instrument | Cash Flow Hedges | Interest Expense      
Derivative [Line Items]      
Net (gain) loss reclassified from OCI (effective portion) [3] 3.9 2.9  
Other Contracts | Designated as Hedging Instrument | Fair Value Hedges | Interest Expense      
Derivative [Line Items]      
Net gain (loss) recognized in other income (expense) [1],[3] (10.1) (14.7)  
Other Contracts | Designated as Hedging Instrument | Net Investment Hedges      
Derivative [Line Items]      
Net gain (loss) recognized in OCI [3] 11.0 (15.6)  
Other Contracts | Not Designated as Hedging Instrument | Other Income (Expense)      
Derivative [Line Items]      
Net gain (loss) recognized in other income (expense) [2],[3] $ (0.8) $ (2.4)  
[1] The impact of fair value hedges noted above was largely offset by recognized gains and losses resulting from the impact of changes in related interest rates on outstanding debt.
[2] The impact of the non-designated hedges noted above was largely offset by recognized gains and losses resulting from the impact of changes in exchange rates on assets and liabilities denominated in nonfunctional currencies.
[3] Other includes the impact on other comprehensive income (OCI) and earnings primarily related to interest rate and cross currency interest rate swaps.