Derivatives - Summary of Impact of Designated Hedges and Gain (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) in OCI	$ (6.2)
Gain (Loss) Reclassified to Income (Loss)	5.0
Cash Flow Hedge
Derivative Instruments, Gain (Loss) [Line Items]
Effective Portion, Gain (Loss) in OCI		$ 12.6	$ 10.2
Effective Portion, Gain (Loss) Reclassified to Income (Loss)		11.1	(8.5)
Ineffective Portion, Gain (Loss) to Operations		0.0	0.0
Discontinued Operations
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified to Income (Loss)	0.0
Discontinued Operations | Cash Flow Hedge
Derivative Instruments, Gain (Loss) [Line Items]
Effective Portion, Gain (Loss) Reclassified to Income (Loss)		(1.7)	1.6
Ineffective Portion, Gain (Loss) to Operations		1.7	1.2
Interest rate swaps | Interest expense | Cash Flow Hedge
Derivative Instruments, Gain (Loss) [Line Items]
Effective Portion, Gain (Loss) in OCI		(0.6)	4.0
Effective Portion, Gain (Loss) Reclassified to Income (Loss)		0.0	0.0
Ineffective Portion, Gain (Loss) to Operations		0.0	0.0
Interest rate swaps | Interest expense | Discontinued Operations | Cash Flow Hedge
Derivative Instruments, Gain (Loss) [Line Items]
Effective Portion, Gain (Loss) Reclassified to Income (Loss)		2.2	1.1
Ineffective Portion, Gain (Loss) to Operations		1.7	1.2
Commodity swaps | Cost of goods sold
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) in OCI	0.9
Gain (Loss) Reclassified to Income (Loss)	(0.2)
Commodity swaps | Cost of goods sold | Cash Flow Hedge
Derivative Instruments, Gain (Loss) [Line Items]
Effective Portion, Gain (Loss) in OCI		(1.1)	(4.5)
Effective Portion, Gain (Loss) Reclassified to Income (Loss)		(0.4)	0.7
Ineffective Portion, Gain (Loss) to Operations		0.0	0.0
Commodity swaps | Cost of goods sold | Discontinued Operations
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified to Income (Loss)	0.0
Commodity swaps | Cost of goods sold | Discontinued Operations | Cash Flow Hedge
Derivative Instruments, Gain (Loss) [Line Items]
Effective Portion, Gain (Loss) Reclassified to Income (Loss)		(4.4)	2.4
Ineffective Portion, Gain (Loss) to Operations		0.0	0.0
Foreign exchange contracts | Cost of goods sold
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) in OCI	(7.2)
Gain (Loss) Reclassified to Income (Loss)	5.3
Foreign exchange contracts | Cost of goods sold | Cash Flow Hedge
Derivative Instruments, Gain (Loss) [Line Items]
Effective Portion, Gain (Loss) in OCI		14.7	10.8
Effective Portion, Gain (Loss) Reclassified to Income (Loss)		11.7	(9.3)
Ineffective Portion, Gain (Loss) to Operations		0.0	0.0
Foreign exchange contracts | Cost of goods sold | Discontinued Operations
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified to Income (Loss)	0.0
Foreign exchange contracts | Cost of goods sold | Discontinued Operations | Cash Flow Hedge
Derivative Instruments, Gain (Loss) [Line Items]
Effective Portion, Gain (Loss) Reclassified to Income (Loss)		0.5	(1.9)
Ineffective Portion, Gain (Loss) to Operations		0.0	0.0
Foreign exchange contracts | Net sales
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) in OCI	0.1
Gain (Loss) Reclassified to Income (Loss)	(0.1)
Foreign exchange contracts | Net sales | Cash Flow Hedge
Derivative Instruments, Gain (Loss) [Line Items]
Effective Portion, Gain (Loss) in OCI		(0.4)	(0.1)
Effective Portion, Gain (Loss) Reclassified to Income (Loss)		(0.2)	0.1
Ineffective Portion, Gain (Loss) to Operations		0.0	0.0
Foreign exchange contracts | Net sales | Discontinued Operations
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified to Income (Loss)	$ 0.0
Foreign exchange contracts | Net sales | Discontinued Operations | Cash Flow Hedge
Derivative Instruments, Gain (Loss) [Line Items]
Effective Portion, Gain (Loss) Reclassified to Income (Loss)		0.0	0.0
Ineffective Portion, Gain (Loss) to Operations		$ 0.0	$ 0.0