Derivative Instruments and Hedging Activities - Additional Information (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	May 17, 2019	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019	Jun. 30, 2019
Derivative [Line Items]
Total long-term debt		$ 3,198.7		$ 3,198.7		$ 2,959.3
Unrealized foreign exchange gain/(loss) within other comprehensive income		3.7	$ 5.9	17.5	$ 17.3
Unrealized foreign exchange gain/(loss) within statement of operations		1.9	$ 2.9	7.7	9.8
Net accumulated gain related to investment hedges				77.3
Proceeds from Issuance of Redeemable Preferred Stock	$ 646.3
Payments of Stock Issuance Costs	$ 3.7
Derivative Liability						$ 26.8
Derivative, Gain (Loss) on Derivative, Net		(26.3)		(24.9)	$ 0.0
Embedded Derivative, Fair Value of Embedded Derivative Liability		51.7		51.7
Euro Denominated Debt Outstanding [Member]
Derivative [Line Items]
Total long-term debt		$ 894.1		$ 894.1