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Marketable Investment Securities - Schedule of Maturities of Debt Securities Classified as Cash Equivalents and Available-For-Sale (Detail) - USD ($)
$ in Millions
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
 [1]
Jun. 30, 2016
 [1]
Schedule of Available-for-sale Securities [Line Items]        
Cash and cash equivalents, Amortized cost $ 93.2 $ 110.9 [1] $ 102.4 $ 68.5
Due within one year, Amortized cost 46.9      
Due after one year through five years, Amortized cost 51.1      
Due after five years, Amortized cost 0.0      
Total, Amortized cost 191.2 211.9    
Due within one year, Estimated fair value 47.0      
Due after one year through five years, Estimated fair value 51.6      
Due after five years, Estimated fair value 0.0      
Total, Estimated fair value 191.8 211.3    
Cash [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Cash and cash equivalents, Amortized cost 68.7 95.6    
Cash equivalents, Estimated fair value 68.7 95.6    
Cash Equivalents [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Cash and cash equivalents, Amortized cost 24.5 15.3    
Cash equivalents, Estimated fair value $ 24.5 $ 15.3    
[1] Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements of this report for additional information.