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Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Statement Of Income And Comprehensive Income [Abstract]        
Net income $ 35.0 $ 21.0 $ 58.8 $ 47.6
Other comprehensive income:        
Change in unrealized net loss on investments (0.7) 0.1 (1.0) 0.2
Reclassification from accumulated other comprehensive income to interest income for accretion of non-current investments (0.5) (0.3) (0.9) (0.7)
Net current-period other comprehensive income (1.2) (0.2) (1.9) (0.5)
Comprehensive income $ 33.8 $ 20.8 $ 56.9 $ 47.1