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Acquired Intangibles and Goodwill - Schedule of Expected Annual Aggregate Amortization Expense (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Jun. 30, 2018
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Goodwill And Intangible Assets Disclosure [Abstract] |  |
Remainder of 2019 | $ 36.0 |
2020 | 50.5 |
2021 | 36.6 |
2022 | 32.0 |
2023 | 19.5 |
2024 | 2.0 |
Thereafter | 0.1 |
To be determined | 4.5 |
Acquired intangibles, Net Carrying Value | $ 181.2 | $ 219.2

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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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