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Condensed Consolidated Statements of Comprehensive Income/(Loss) (Unaudited) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]        
Net income/(loss) $ 6.7 $ (13.7) $ 23.3 $ (122.6)
Other comprehensive loss:        
Change in unrealized net gain on investment     (1.5)  
Net current period-other comprehensive loss     (1.5)  
Comprehensive income/(loss) $ 6.7 $ (13.7) $ 21.8 $ (122.6)