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Marketable Investment Securities - Schedule of Maturities of Debt Securities Classified as Cash Equivalents and Available-For-Sale (Detail)
$ in Millions
Jun. 30, 2015
USD ($)
Schedule of Available-for-sale Securities [Line Items]  
Due within one year, Amortized cost $ 80.7
Due after one year through five years, Amortized cost 40.6
Due after five years, Amortized cost 0.0
Total 185.4
Due within one year, Estimated fair value 80.7
Due after one year through five years, Estimated fair value 40.6
Due after five years, Estimated fair value 0.0
Total 185.4
Cash  
Schedule of Available-for-sale Securities [Line Items]  
Cash, Amortized cost 54.7
Cash, Estimated fair value 54.7
Cash Equivalents  
Schedule of Available-for-sale Securities [Line Items]  
Cash equivalents, Amortized cost 9.4
Cash equivalents, Estimated fair value $ 9.4