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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