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Stock-Based Compensation - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Stock-based compensation expense $ 18.6 $ 16.2 $ 29.4 $ 24.7
Related tax benefits 4.2 $ 4.4 6.6 $ 7.3
Unrecognized compensation cost related to non-vested stock options 13.9   13.9  
Unrecognized compensation cost related to restricted stock unit awards $ 63.2   $ 63.2  
Amortization period of unrecognized compensation cost for non-vested stock options     2 years 10 months 21 days  
Amortization period of unrecognized compensation cost for restricted stock awards     1 year 9 months 22 days