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

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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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Short-Term and Long-Term Debt - Narrative (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Mar. 31, 2023	Sep. 30, 2022	Dec. 31, 2022
Debt Instrument [Line Items]
Short-term debt	$ 513.8	$ 359.3
Commercial Paper
Debt Instrument [Line Items]
Short-term debt	$ 434.5	$ 317.0
Debt, weighted average interest rate	4.84%	3.03%
Debt instrument, term	13 days	22 days
Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			$ 75.0
Unsecured line of credit, amount borrowed	$ 50.0
Stated interest rate	5.78%
Interest Bearing Loan
Debt Instrument [Line Items]
Short-term debt	$ 23.5	$ 42.3