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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, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total | $ 15.1 | $ 16.2 | $ 26.3 | $ 32.9
Income tax expense/(benefit) on share-based compensation | (1.8) | 0.3 | (2.7) | (2.4)
Phantom Stock Unit [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total | 3.0 |  |  |
Cost of Revenue [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total | 0.6 | 0.8 | 1.3 | 1.7
Cost of Revenue [Member] | Phantom Stock Unit [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total | 0.1 |  |  |
Research and Development [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total | 8.1 | 8.5 | 15.6 | 16.8
Research and Development [Member] | Phantom Stock Unit [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total | 2.5 |  |  |
Selling, General, and Administrative [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total | 6.4 | $ 6.9 | $ 9.4 | $ 14.4
Selling, General, and Administrative [Member] | Phantom Stock Unit [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total | $ 0.4 |  |  |

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