COMMON STOCK AND TREASURY STOCK - Summary of Activity Related to Stock Repurchase Programs (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Jun. 30, 2020 |
Jun. 30, 2019 |
Jun. 30, 2018 |
|
| Equity [Abstract] | |||
| Number of shares repurchased and retired (in shares) | 5.8 | 4.7 | 7.2 |
| Average price per share (in dollars per share) | $ 119.45 | $ 99.38 | $ 62.13 |
| Aggregate purchase price | $ 697.9 | $ 470.4 | $ 445.0 |