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Preferred and Common Stockholders' Equity - Narrative (Details) - USD ($) | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2017
Class of Stock [Line Items] |  |  |  |  |
Preferred stock, authorized (shares) | 5,000,000.0 |  |  |  |
Preferred stock, par value (dollars per share) | $ 0.01 |  |  |  |
Preferred stock, outstanding (shares) | 0 |  |  |  |
Common stock, authorized (shares) | 150,000,000.0 |  |  |  |
Common stock, par value (dollars per share) | $ 0.01 |  |  |  |
Common stock, issued (shares) | 75,200,000 |  | 74,700,000 | 73,500,000 |
Common stock, outstanding (shares) | 75,200,000 |  | 74,700,000 | 73,500,000 |
Share repurchase program, remaining authorized repurchase amount | $ 110,700,000 |  |  |  |
Shares repurchased | 0 | 0 |  |  |
Eighth Share Repurchase Program |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Share repurchase program, authorized amount |  |  |  |  | $ 200,000,000.0

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