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Marketable Investment Securities - Schedule of Maturities of Debt Securities Classified as Cash Equivalents and Available-For-Sale Securities (Detail) - USD ($)
$ in Millions
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
 [1]
Jun. 30, 2017
 [1]
Schedule of Available-for-sale Securities [Line Items]        
Cash and cash equivalents, Amortized cost $ 84.9 $ 110.9 [1] $ 97.4 $ 102.4
Due within one year, Amortized cost 66.3      
Due after one year through five years, Amortized cost 38.7      
Due after five years, Amortized cost 0.0      
Total, Amortized cost 189.9 211.9    
Due within one year, Estimated fair value 66.2      
Due after one year through five years, Estimated fair value 38.9      
Due after five years, Estimated fair value 0.0      
Total, Estimated fair value 190.0 211.3    
Cash [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Cash and cash equivalents, Amortized cost 70.3 95.6    
Cash equivalents, Estimated fair value 70.3 95.6    
Cash Equivalents [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Cash and cash equivalents, Amortized cost 14.6 15.3    
Cash equivalents, Estimated fair value $ 14.6 $ 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 contained in Part I, Item 1 of this report for additional information.