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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	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Equity [Abstract]
Shares purchased and retired	0.0	0.0	1.6	0.0
Common stock and additional paid-in-capital reductions	$ 0.0	$ 0.0	$ 16.9	$ 0.0
Charges to retained earnings	$ 0.0	$ 0.0	$ 33.1	$ 0.0

X

- Definition

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

+ References

No definition available.

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- Definition

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

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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
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-Topic 505
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-SubTopic 10
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