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Condensed Consolidated Statements of Comprehensive Income/ (Loss) (Unaudited) - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]    
Net income/(loss) $ 3.8 $ (26.5)
Other comprehensive loss:    
Change in unrealized net gain on investment (1.5)  
Net current period-other comprehensive loss (1.5)  
Comprehensive income/(loss) $ 2.3 $ (26.5)