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Fair Value of Financial Instruments - Schedule of Carrying Values and Fair Values for Financial Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	$ 66.9	$ 230.8
Derivative Assets	1.2	9.5
Derivative Liabilities	14.2	2.3
Debt	2,595.4	2,468.8
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	0.0	230.8
Derivative Assets	0.0	9.5
Derivative Liabilities	0.0	2.3
Debt	2,476.3	2,351.3
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	66.9	230.8
Derivative Assets	0.0	0.0
Derivative Liabilities	0.0	0.0
Debt	0.0	0.0
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	0.0	0.0
Derivative Assets	1.2	9.5
Derivative Liabilities	14.2	2.3
Debt	2,595.4	2,468.8
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	0.0	0.0
Derivative Assets	0.0	0.0
Derivative Liabilities	0.0	0.0
Debt	0.0	0.0
SB/RH | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	2,595.4	2,391.8
SB/RH | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	2,476.3	2,276.0
SB/RH | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	0.0	0.0
SB/RH | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	2,595.4	2,391.8
SB/RH | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	$ 0.0	$ 0.0

X

- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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