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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

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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 + Details
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