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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2021	Sep. 30, 2020	Sep. 30, 2017	Jun. 30, 2016
Statement of Financial Position [Abstract]
Accounts Receivable, Allowance for Credit Loss, Current	$ (5.8)	$ (4.8)
Series A common stock, shares authorized			600,000,000	600,000,000
Series A common stock, shares outstanding	158,490,451	158,064,750

X

- Definition

Amount of allowance for credit loss on accounts receivable, classified as current.

+ References

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-Topic 210
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- Definition

The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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