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Condensed Consolidated Statements of Comprehensive Income/ (Loss) (Unaudited) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]        
Net income/(loss) $ 12.8 $ (82.4) $ 16.6 $ (108.9)
Other comprehensive loss:        
Change in unrealized net gain on investment     (1.5)  
Net current period-other comprehensive loss     (1.5)  
Comprehensive income/(loss) $ 12.8 $ (82.4) $ 15.1 $ (108.9)