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Income Taxes - Narrative (Details) - USD ($) $ in Millions			3 Months Ended	9 Months Ended		12 Months Ended
	Dec. 22, 2017	Dec. 21, 2017	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2018	Mar. 31, 2018
Business Acquisition [Line Items]
Effective tax rate, percent				30.30%	45.30%
Corporate tax rate	21.00%	35.00%		24.50%
Tax expense			$ 0.6	$ 36.7		$ 3.0
Transition tax							$ 30.0
State and Local Jurisdiction
Business Acquisition [Line Items]
Tax expense				$ 0.7

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- Definition

Tax Adjustments, Settlements and Unusual Provisions, Deferred Tax Remeasurement Tax Expense

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

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

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of tax liability from transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act, classified as noncurrent.

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