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Stock-Based Compensation - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]          
Stock-based compensation expense $ 14.0   $ 13.3 $ 22.8 $ 22.2
Related tax benefits 4.9   $ 4.9 8.1 $ 8.3
Unrecognized compensation cost related to non-vested stock options $ 8.3     8.3  
Unrecognized compensation cost of restricted stock awards       $ 55.8  
Amortization period of unrecognized compensation cost for non-vested stock options   2 years 2 months 9 days      
Amortization period of unrecognized compensation cost for restricted stock awards       1 year 9 months 7 days