Short-Term and Long-Term Debt - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Dec. 31, 2022	Sep. 30, 2022
Debt Instrument [Line Items]
Short-term debt	$ 548.2	$ 359.3
Commercial Paper
Debt Instrument [Line Items]
Short-term debt	$ 462.0	$ 317.0
Debt, weighted average interest rate	4.40%	3.03%
Debt instrument, term	22 days	22 days
Interest Bearing Loan
Debt Instrument [Line Items]
Short-term debt	$ 23.5	$ 42.3
Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 75.0
Stated interest rate	5.35%
Unsecured line of credit, amount borrowed	$ 50.0

Contractual interest rate for funds borrowed, under the debt agreement.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average interest rate of debt outstanding.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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