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Retirement Benefits (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Sep. 30, 2024
Defined Benefit Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Company contributions	$ 8.2	$ 12.0	$ 34.7
Defined Benefit Pension Plan \| Minimum
Defined Benefit Plan Disclosure [Line Items]
Total expected contributions for current fiscal year	30.0
Defined Benefit Pension Plan \| Maximum
Defined Benefit Plan Disclosure [Line Items]
Total expected contributions for current fiscal year	40.0
Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Amortization of actuarial gain	$ 0.3	$ 0.1