Goodwill and Intangible Assets, Net - Schedule of Changes in Goodwill (Details) - USD ($) $ in Millions |
3 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
Dec. 31, 2017 |
Jun. 30, 2019 |
Jun. 30, 2018 |
Jun. 30, 2017 |
|
| Goodwill [Roll Forward] | ||||
| Goodwill, gross | $ 1,254.9 | $ 1,159.3 | ||
| Transfers | $ 0.0 | 0.0 | ||
| Transfers (a) | 247.7 | 88.2 | ||
| Fair value adjustments (b) | 7.4 | 0.0 | ||
| Fair value adjustments (b) | (10.0) | 7.4 | ||
| Foreign currency translation and other | 0.0 | 0.0 | ||
| Goodwill | 1,500.0 | 1,254.9 | ||
| Investor Communication Solutions | ||||
| Goodwill [Roll Forward] | ||||
| Goodwill, gross | 884.4 | 821.0 | ||
| Transfers | $ (38.7) | 0.0 | (38.7) | |
| Transfers (a) | 27.3 | 88.2 | ||
| Fair value adjustments (b) | 7.4 | 0.0 | ||
| Fair value adjustments (b) | (3.2) | 13.9 | ||
| Foreign currency translation and other | 0.0 | 0.0 | ||
| Goodwill | 915.9 | 884.4 | ||
| Global Technology and Operations | ||||
| Goodwill [Roll Forward] | ||||
| Goodwill, gross | 370.5 | $ 338.4 | ||
| Transfers | 0.0 | 38.7 | ||
| Transfers (a) | 220.4 | 0.0 | ||
| Fair value adjustments (b) | 0.0 | 0.0 | ||
| Fair value adjustments (b) | (6.8) | (6.5) | ||
| Foreign currency translation and other | 0.0 | 0.0 | ||
| Goodwill | $ 584.2 | $ 370.5 | ||