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Preferred and Common Stockholders' Equity (Tables)
 6 Months Ended
Dec. 31, 2020
Equity [Abstract]  
Summary of Common Shares Issued and Outstanding
Common shares issued and outstanding
Transition Period Ended December 31,Years Ended June 30,
(in millions)2020202020192018
Beginning common stock issued and outstanding74.7 73.5 70.6 68.4 
Common stock issued upon exercise of options and employee stock plans
0.7 1.2 4.5 2.2 
Repurchase and retirement of common stock— — (1.6)— 
Ending common stock issued and outstanding75.4 74.7 73.5 70.6 
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, 2020, June 30, 2020, June 30, 2019, and June 30, 2018 were as follows:
Transition Period Ended December 31,Years Ended June 30,
(in millions)2020202020192018
Shares purchased and retired— — 1.6 — 
Common stock and additional paid-in-capital reductions$— $— $16.9 $— 
Charges to retained earnings$— $— $33.1 $—