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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Millions
Total
Common Stock [Member]
Additional paid-in capital [Member]
Accumulated other comprehensive loss [Member]
Retained earnings (accumulated deficit) [Member]
Beginning Balance at Jun. 30, 2015 $ 661.7 $ 0.7 $ 745.4 $ (7.0) $ (77.4)
Issuance of common stock under share-based compensation plans 94.3   94.3    
Share-based payment expense 31.6   31.6    
Repurchase and retirement of common stock (162.7)   (41.2)   (121.5)
Net income 117.2       117.2
Other comprehensive income (loss), net of tax (2.5)     (2.5)  
Ending Balance at Jun. 30, 2016 739.6 0.7 830.1 (9.5) (81.7)
Issuance of common stock under share-based compensation plans 6.0   6.0    
Share-based payment expense 29.9   29.9    
Repurchase and retirement of common stock (31.6)   (14.6)   (17.0)
Net income 20.5       20.5
Other comprehensive income (loss), net of tax 4.0     4.0  
Ending Balance at Jun. 30, 2017 768.4 0.7 851.4 (5.5) (78.2)
Issuance of common stock under share-based compensation plans 36.9   36.9    
Share-based payment expense 27.1   27.1    
Net income 131.1       131.1
Other comprehensive income (loss), net of tax 1.4     1.4  
Ending Balance at Jun. 30, 2018 $ 964.9 $ 0.7 $ 915.4 $ (4.1) $ 52.9