Income Taxes - Deferred Tax Assets, Net (Details) $ in Millions	3 Months Ended
	Dec. 31, 2023 USD ($)
Deferred Tax Assets, Net [Abstract]
Deferred tax assets, net, outside basis difference in foreign subsidiary	$ 0.9
Deferred tax assets, net, benefit, deductible foreign exchange losses on repatriation measured at foreign exchange rate	2.9
Deferred tax liabilities, net, state income taxes, net of domestic benefit	2.0
Deferred tax assets, net, increase (decrease), amount, changes in foreign exchange rates	$ (5.2)