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Segment and Related Information - Schedule of Total Operating Income for Reportable Segments (Detail) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2013
Segment Reporting Information [Line Items]      
Total operating income for reportable segments $ 134.2 $ 274.4 $ 228.0
Interest income 0.4 5.4 5.5
Other 0.3 (2.0) (0.2)
Income before income tax 134.9 277.8 233.3
Income tax provision 54.7 101.6 86.1
Net income $ 80.2 $ 176.2 $ 147.2