Income Taxes (Schedule of Reconciliation of Income Taxes at Statutory Rate) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Computed tax a federal statutory rate, amount	$ 5.0	$ 25.4	$ 31.0
State income taxes, net of federal tax benefit, amount	(2.4)	0.9	2.7
Foreign tax less than the federal rate, amount	(4.1)	(9.1)	(1.0)
Adjustments to prior years' tax accruals	(8.6)	(4.3)	(6.1)
Other taxes including repatriation of foreign earnings, amount		7.1	4.4
Other adjustments, amount	3.8	4.0	1.9
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount	0.1	1.7	(0.5)
Uncertain tax position	(6.7)	(3.4)	0.6
effective income tax rate reconciliation, goodwill	$ 8.4
Effective Income Tax Rate Reconciliation, Goodwil, Percent	35.30%
Effective Income Tax Rate Reconciliation, Rerate of deferred tax balances, Amount	$ (2.8)
Income tax provision (benefit)	$ (1.8)	$ 22.3	$ 33.0
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Computed tax at federal statutory rate, percent	21.00%	21.00%	21.00%
State income taxes, net of federal tax benefit, percent	(10.20%)	0.70%	1.80%
Foreign tax less than the federal rate, perecent	(17.10%)	(7.60%)	(0.70%)
Adjustments to prior years' tax accruals, percent	(36.20%)	(3.50%)	(4.20%)
Other taxes including repatriation of foreign earnings, percent	23.80%	5.90%	3.10%
Other, net, percent	15.90%	3.40%	1.20%
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Percent	0.30%	1.40%	(0.30%)
Uncertain tax position, percent	(28.40%)	(2.80%)	0.40%
Effective Income Tax Rate Reconciliation, Goodwil, Percent	35.30%
Effective Income Tax Rate Reconciliation, Rerate of deferred tax balances, Percent	(11.70%)
Total, percent	(7.30%)	18.50%	22.30%
Effective Income Tax Rate Reconciliation [Line Items]
Computed tax a federal statutory rate, amount	$ 5.0	$ 25.4	$ 31.0
Computed tax at federal statutory rate, percent	21.00%	21.00%	21.00%
State income taxes, net of federal tax benefit, amount	$ (2.4)	$ 0.9	$ 2.7
State income taxes, net of federal tax benefit, percent	(10.20%)	0.70%	1.80%
Foreign tax less than the federal rate, amount	$ (4.1)	$ (9.1)	$ (1.0)
Foreign tax less than the federal rate, perecent	(17.10%)	(7.60%)	(0.70%)
Adjustments to prior years' tax accruals	$ (8.6)	$ (4.3)	$ (6.1)
Adjustments to prior years' tax accruals, percent	(36.20%)	(3.50%)	(4.20%)
Other taxes including repatriation of foreign earnings, amount		$ 7.1	$ 4.4
Other taxes including repatriation of foreign earnings, percent	23.80%	5.90%	3.10%
Other adjustments, amount	$ 3.8	$ 4.0	$ 1.9
Other, net, percent	15.90%	3.40%	1.20%
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount	$ 0.1	$ 1.7	$ (0.5)
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Percent	0.30%	1.40%	(0.30%)
Uncertain tax position	$ (6.7)	$ (3.4)	$ 0.6
Uncertain tax position, percent	(28.40%)	(2.80%)	0.40%
effective income tax rate reconciliation, goodwill	$ 8.4
Effective Income Tax Rate Reconciliation, Goodwil, Percent	35.30%
Effective Income Tax Rate Reconciliation, Rerate of deferred tax balances, Amount	$ (2.8)
Effective Income Tax Rate Reconciliation, Rerate of deferred tax balances, Percent	(11.70%)
Income tax (benefit) provision	$ (1.8)	$ 22.3	$ 33.0
Total, percent	(7.30%)	18.50%	22.30%
Foreign Tax Jurisdiction [Member]
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Other taxes including repatriation of foreign earnings, amount	$ 5.5
Effective Income Tax Rate Reconciliation [Line Items]
Other taxes including repatriation of foreign earnings, amount	$ 5.5