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Condensed Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]        
Net income attributable to Myriad Genetics, Inc. shareholders $ 4.2 $ 34.5 $ 9.0 $ 102.0
Unrealized gain (loss) on available-for-sale securities, net of tax 0.1 0.3 (0.5) 0.2
Change in foreign currency translation adjustment, net of tax 3.2 0.5 (0.6) (1.5)
Comprehensive income 7.5 35.3 7.9 100.7
Comprehensive income attributable to non-controlling interest 0.0 0.0 0.0 0.0
Comprehensive income attributable to Myriad Genetics, Inc. shareholders $ 7.5 $ 35.3 $ 7.9 $ 100.7