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Preferred and Common Stockholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended	12 Months Ended
	Dec. 31, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Equity [Abstract]
Preferred stock, shares authorized	5,000,000.0
Preferred stock, par value (dollars per share)	$ 0.01
Preferred stock, shares outstanding	0	0	0	0
Common stock, shares authorized	150,000,000.0
Common stock, par value (dollars per share)	$ 0.01
Common stock, shares issued	75,400,000	74,700,000	73,500,000	70,600,000	68,400,000
Common stock, shares outstanding	75,400,000	74,700,000	73,500,000	70,600,000	68,400,000
Stock repurchase program, authorized amount						$ 200.0
Stock repurchase program, remaining repurchase authorization	$ 110.7
Repurchase of Company stock	$ 0.0	$ 0.0	$ 50.0	$ 0.0

X

- Definition

Face amount or stated value per share of common stock.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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

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The cash outflow to reacquire common stock during the period.

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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Amount remaining of a stock repurchase plan authorized.

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