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Share-Based Compensation - Share-Based Compensation, Cash-Based Awards and Related Tax Benefit Recognized in Condensed Consolidated Statements of Operations (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Total | $ 23.4 | $ 15.1 | $ 44.9 | $ 26.3
Income tax benefit on share-based compensation | (5.4) | (1.8) | (9.0) | (2.7)
Phantom Stock Unit [Member] |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Total | 4.2 | 3.0 | 11.4 | 3.0
Cost of Revenue [Member] |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Total | 1.0 | 0.6 | 1.8 | 1.3
Cost of Revenue [Member] | Phantom Stock Unit [Member] |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Total | 0.1 | 0.1 | 0.2 | 0.1
Research and Development [Member] |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Total | 9.5 | 8.1 | 20.5 | 15.6
Research and Development [Member] | Phantom Stock Unit [Member] |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Total | 3.4 | 2.5 | 9.2 | 2.5
Selling, General, and Administrative [Member] |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Total | 12.9 | 6.4 | 22.6 | 9.4
Selling, General, and Administrative [Member] | Phantom Stock Unit [Member] |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Total | $ 0.7 | $ 0.4 | $ 2.0 | $ 0.4

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