Derivative Instruments and Hedging Activities - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Derivative [Line Items]
Derivatives used in Net Investment Hedge, Increase (Decrease), Gross of Tax	$ (13.9)	$ (4.1)	$ (3.9)	$ (1.6)
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(13.5)	$ (3.1)	(5.9)	$ 1.3
Net accumulated gain related to investment hedges			77.5
Euro Denominated Debt Outstanding [Member]
Derivative [Line Items]
Total long-term debt	$ 744.0		$ 744.0