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Income Taxes - (Details) - ASU 2016-09 - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Net discrete tax benefits (expenses) for equity-based compensation	$ (0.2)		$ (0.5)	$ 6.8
Effective income tax rate (as a percent)			30.10%	8.70%
Effective income tax rate excluding certain discrete tax items (as a percent)	33.70%	3.40%
Return-to-provision true-up adjustments	$ 2.2	$ 5.1	$ 2.3	$ 12.0
Provision true-up adjustment	$ 2.4		$ 2.8	$ 5.2

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- Definition

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

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Adjustments for the tax effects of employee stock option transactions that are recognized differently for financial reporting and tax purposes, occurring during the period and charged or credited directly to shareholders' equity.

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Amount of provision true up adjustment.

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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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The tax effects of employee stock option transactions that are recognized differently for financial reporting and tax purposes, occurring during the period and charged or credited directly to shareholders' equity.

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