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Preferred and Common Stockholders' Equity - Stock Repurchases (Details) - USD ($) shares in Millions, $ in Millions	6 Months Ended	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2021	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Equity [Abstract]
Shares purchased and retired	0.0	0.0	0.0	1.6
Common stock and additional paid-in-capital reductions	$ 0.0	$ 0.0	$ 0.0	$ 16.9
Charges to retained earnings	$ 0.0	$ 0.0	$ 0.0	$ 33.1
Common stock, shares issued	75.4	80.0	74.7	73.5	70.6

X

- Definition

Amount charged to retained earnings as a result of stock repurchases.

+ References

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- Definition

Amount of reduction in common stock as a result of stock repurchases.

+ References

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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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 505
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