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Basis of Presentation - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]    
Total costs and expenses $ 102.8 $ 171.8
Operating income (loss) 87.4 5.7
Other income (expense) (0.3) (1.3)
Total other income (0.8) $ (1.7)
Understated [Member]    
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]    
Total costs and expenses 0.5  
Operating income (loss) 0.5  
Overstated [Member]    
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]    
Other income (expense) 0.5  
Total other income $ 0.5  
Assurex [Member]    
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]    
Non controlling interest ownership percentage by parent 85.00%  
Centre For Addiction And Mental Health [Member]    
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]    
Non controlling interest ownership percentage by noncontrolling owners 15.00%