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Preferred and Common Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2021
Equity [Abstract] |
Summary of Common Shares Issued and Outstanding | Common shares issued and outstanding
| Year Ended December 31, |  | Six-month Transition Period Ended December 31, |  | Years Ended June 30,
(in millions) | 2021 |  | 2020 |  | 2020 |  | 2019
Beginning common stock issued and outstanding | 75.4 |  |  | 74.7 |  |  | 73.5 |  |  | 70.6 |
Common stock issued upon exercise of options and employee stock plans | 4.6 |  |  | 0.7 |  |  | 1.2 |  |  | 4.5 |
Repurchase and retirement of common stock | — |  |  | — |  |  | — |  |  | (1.6) |
Ending common stock issued and outstanding | 80.0 |  |  | 75.4 |  |  | 74.7 |  |  | 73.5 |
Schedule of Stock Repurchases | The shares retired, aggregate common stock and additional paid-in capital reductions, and related charges to Retained earnings (accumulated deficit) for the repurchases for periods ended December 31, 2021, December 31, 2020, June 30, 2020, and June 30, 2019 were as follows:
| Year Ended December 31, |  | Six-month Transition Period Ended December 31, |  | Years Ended June 30,
(in millions) | 2021 |  | 2020 |  | 2020 |  | 2019
Shares purchased and retired | — |  |  | — |  |  | — |  |  | 1.6 |
Common stock and additional paid-in-capital reductions | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 16.9 |
Charges to retained earnings | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 33.1 |

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