Goodwill and Identifiable Intangible Assets - Future Amortization Expense (Details) $ in Millions |
Jun. 30, 2017
USD ($)
|
|---|---|
| Goodwill and Intangible Assets Disclosure [Abstract] | |
| 2018 | $ 72.5 |
| 2019 | 71.1 |
| 2020 | 70.8 |
| 2021 | 70.4 |
| 2022 | 70.4 |
| 2023 and thereafter | 191.7 |
| Total | $ 546.9 |