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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]        
Provision for income taxes $ 21.1 $ 16.9 $ 39.2 $ 34.4
Effective income tax rate 34.40% 32.80% 34.70% 33.90%