Definite Lived Long-Lived Assets - Other Intangible Assets Subject to Amortization (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016	Jun. 30, 2016
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	$ 11.0	$ 11.4	$ 33.1	$ 35.0
Gross Carrying Value	623.4		623.4		$ 609.5
Accumulated Amortization	(340.8)		(340.8)		(315.5)
Net Carrying Value	282.6		$ 282.6		$ 294.0
Core technology [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			18 years		18 years
Gross Carrying Value	168.3		$ 168.3		$ 170.6
Accumulated Amortization	(71.3)		(71.3)		(64.9)
Net Carrying Value	97.0		$ 97.0		$ 105.7
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			14 years		14 years
Gross Carrying Value	251.4		$ 251.4		$ 230.3
Accumulated Amortization	(100.5)		(100.5)		(90.9)
Net Carrying Value	150.9		$ 150.9		$ 139.4
Product relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			12 years		12 years
Gross Carrying Value	203.7		$ 203.7		$ 208.6
Accumulated Amortization	(169.0)		(169.0)		(159.7)
Net Carrying Value	$ 34.7		$ 34.7		$ 48.9