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Financial Instruments (Schedule of Gain/Loss Related to Derivative Instruments) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Designated as Hedging Instrument | Cash Flow Hedges    
Derivative [Line Items]    
Net gain (loss) recognized in OCI (effective portion) $ (12.6) $ 13.7
Net (gain) loss reclassified from OCI to sales/cost of sales (effective portion) 18.3 0.2
Net (gain) loss reclassified from OCI to other income (expense), net (effective portion) 6.7 (46.0)
Net (gain) loss reclassified from OCI to interest expense (effective portion) 0.8 10.0
Net (gain) loss reclassified from OCI to other income (expense), net (ineffective portion) (1.6) (0.2)
Designated as Hedging Instrument | Fair Value Hedges    
Derivative [Line Items]    
Net (gain) loss recognized in interest expense [1] (14.7) (8.8)
Designated as Hedging Instrument | Net Investment Hedges    
Derivative [Line Items]    
Net gain (loss) recognized in OCI (59.5) 42.8
Not Designated as Hedging Instrument    
Derivative [Line Items]    
Net gain (loss) recognized in other income (expense) [2] 1.7 (3.4)
Forward Exchange Contracts | Designated as Hedging Instrument | Cash Flow Hedges    
Derivative [Line Items]    
Net gain (loss) recognized in OCI (effective portion) 0.3 10.5
Net (gain) loss reclassified from OCI to sales/cost of sales (effective portion) 18.3 0.2
Net (gain) loss reclassified from OCI to other income (expense), net (effective portion) (3.8) (25.7)
Net (gain) loss reclassified from OCI to interest expense (effective portion) (2.1) 6.7
Net (gain) loss reclassified from OCI to other income (expense), net (ineffective portion) (1.6) (0.2)
Forward Exchange Contracts | Designated as Hedging Instrument | Fair Value Hedges    
Derivative [Line Items]    
Net (gain) loss recognized in interest 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 (11.1) 17.4
Forward Exchange Contracts | Not Designated as Hedging Instrument    
Derivative [Line Items]    
Net gain (loss) recognized in other income (expense) [2] 4.1 (1.8)
Foreign Currency Debt | Designated as Hedging Instrument | Net Investment Hedges    
Derivative [Line Items]    
Net gain (loss) recognized in OCI (32.8) (9.6)
Other Contracts | Designated as Hedging Instrument | Cash Flow Hedges    
Derivative [Line Items]    
Net gain (loss) recognized in OCI (effective portion) [3] (12.9) 3.2
Net (gain) loss reclassified from OCI to sales/cost of sales (effective portion) [3] 0.0 0.0
Net (gain) loss reclassified from OCI to other income (expense), net (effective portion) [3] 10.5 (20.3)
Net (gain) loss reclassified from OCI to interest expense (effective portion) [3] 2.9 3.3
Net (gain) loss reclassified from OCI to other income (expense), net (ineffective portion) [3] 0.0 0.0
Other Contracts | Designated as Hedging Instrument | Fair Value Hedges    
Derivative [Line Items]    
Net (gain) loss recognized in interest expense [1],[3] (14.7) (8.8)
Other Contracts | Designated as Hedging Instrument | Net Investment Hedges    
Derivative [Line Items]    
Net gain (loss) recognized in OCI [3] (15.6) 35.0
Other Contracts | Not Designated as Hedging Instrument    
Derivative [Line Items]    
Net gain (loss) recognized in other income (expense) [2],[3] $ (2.4) $ (1.6)
[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.