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, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015	Jun. 30, 2015
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	$ 11.4	$ 11.8	$ 35.0	$ 34.7
Gross Carrying Value	630.2		630.2		$ 659.7
Accumulated Amortization	(313.9)		(313.9)		(291.0)
Net Carrying Value	316.3		$ 316.3		$ 368.7
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	173.9		$ 173.9		$ 177.6
Accumulated Amortization	(63.9)		(63.9)		(57.6)
Net Carrying Value	110.0		$ 110.0		$ 120.0
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	241.7		$ 241.7		$ 259.2
Accumulated Amortization	(90.3)		(90.3)		(81.8)
Net Carrying Value	151.4		$ 151.4		$ 177.4
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	214.6		$ 214.6		$ 222.9
Accumulated Amortization	(159.7)		(159.7)		(151.6)
Net Carrying Value	$ 54.9		$ 54.9		$ 71.3