XML 62 R52.htm IDEA: XBRL DOCUMENT v3.8.0.1
Long-Term Debt - Schedule of Long-Term Debt (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Jun. 30, 2017
Long-term Debt, Unclassified [Abstract]    
Long-term debt $ 44.0 $ 100.0
Long-term debt discount (0.8) (0.9)
Net long-term debt $ 43.2 $ 99.1