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Segment and Related Information - Schedule of Total Operating Income for Reportable Segments (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Segment Reporting [Abstract]        
Total operating income for reportable segments $ 42.6 $ 35.7 $ 131.2 $ 98.0
Interest income 0.3 0.1 0.5 0.3
Other 0.2 (0.3)   1.1
Income before income tax 43.1 35.5 131.7 99.4
Income tax provision 10.5 14.1 42.1 37.9
Net income $ 32.6 $ 21.4 $ 89.6 $ 61.5