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Income Taxes - Additional information (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Income taxes
Effective tax rate (as a percent)	25.00%	19.00%	21.80%	19.70%	5.40%
Valuation allowance related to net operating losses and other deferred tax assets			$ 197.7	$ 217.5
Corporate tax rate			21.00%	21.00%	21.00%
Tax expense related to audit settlement			$ 13.2
Tax rate changes			(26.8)	$ (0.5)	$ (1.9)
Tax benefit from foreign subsidiaries			(53.2)	(55.7)	(41.7)
Change in valuation allowance			19.8
United States
Income taxes
Valuation allowance related to net operating losses and other deferred tax assets					38.1
Tax benefit from income tax examination					$ 38.1
United Kingdom
Income taxes
Tax rate changes			$ 25.9
Canada
Income taxes
Valuation allowance related to net operating losses and other deferred tax assets				$ 31.7

X

- Definition

Amount of current foreign income tax expense (benefit) pertaining to income (loss) from continuing operations.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The amount the liability recorded for the income tax examination increased or decreased in the current year/accounting period.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates.

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