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Preferred and Common Stockholders' Equity - Common Shares Issued and Outstanding (Details) - shares shares in Millions	6 Months Ended	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2021	Jun. 30, 2020	Jun. 30, 2019
Common shares issued and outstanding
Beginning common stock issued	74.7	75.4	73.5	70.6
Beginning common stock outstanding	74.7	75.4	73.5	70.6
Common stock issued upon exercise of options and employee stock plans	0.7	4.6	1.2	4.5
Repurchase and retirement of common stock	0.0	0.0	0.0	(1.6)
Ending common stock issued	75.4	80.0	74.7	73.5
Ending common stock outstanding	75.4	80.0	74.7	73.5

X

- Definition

Stock Issued During Period, Shares, Share-Based Payment Arrangement And Employee Stock Purchase Plans

+ References

No definition available.

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- Definition

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.

+ References

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-Topic 210
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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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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Number of shares that have been repurchased and retired during the period.

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