Derivative Financial Instruments Derivative Financial Instruments (Fair Value of Outstanding Derivative Contracts) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Sep. 30, 2018
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Assets	$ 0.0
Designated as Hedging Instrument [Member] | Interest Rate Contract [Member]
Derivative [Line Items]
Derivative Assets	0.0	$ 0.0
Derivative Liabilities	30.5	0.0
Designated as Hedging Instrument [Member] | Cross-Currency Swap [Member]
Derivative [Line Items]
Derivative Assets	3.1	5.8
Derivative Liabilities	9.3	9.3
Designated as Hedging Instrument [Member] | Foreign Currency Contract - Other [Member]
Derivative [Line Items]
Derivative Assets	16.5	13.6
Derivative Liabilities	1.2	5.3
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative Assets	0.0	0.0
Derivative Liabilities	4.5	32.5
Not Designated as Hedging Instrument [Member] | Foreign Currency Contract - Other [Member]
Derivative [Line Items]
Derivative Assets	10.2	13.7
Derivative Liabilities	7.4	2.5
Not Designated as Hedging Instrument [Member] | Dairy Contracts [Member]
Derivative [Line Items]
Derivative Assets	0.2	0.2
Derivative Liabilities	0.0	0.1
Not Designated as Hedging Instrument [Member] | Diesel and Other Contracts [Member]
Derivative [Line Items]
Derivative Assets	0.7	1.6
Derivative Liabilities	$ 3.4	$ 0.3