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, 2020	Mar. 31, 2020	Jun. 30, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 1,432.2	$ 1,432.2	$ 1,434.1
Accumulated Amortization	(524.9)	(524.9)	(503.3)
Net Carrying Value	907.3	$ 907.3	$ 930.8
Core technology [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Life		19 years	18 years
Gross Carrying Value	133.1	$ 133.1	$ 168.2
Accumulated Amortization	(80.3)	(80.3)	(105.6)
Net Carrying Value	52.8	$ 52.8	$ 62.6
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Life		14 years	14 years
Gross Carrying Value	1,016.6	$ 1,016.6	$ 981.1
Accumulated Amortization	(228.3)	(228.3)	(182.5)
Net Carrying Value	788.3	$ 788.3	$ 798.6
Product Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Life		11 years	11 years
Gross Carrying Value	268.0	$ 268.0	$ 275.5
Accumulated Amortization	(212.9)	(212.9)	(213.9)
Net Carrying Value	$ 55.1	55.1	$ 61.6
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Life	4 years		4 years
Gross Carrying Value	$ 14.5	14.5	$ 9.3
Accumulated Amortization	(3.4)	(3.4)	(1.3)
Net Carrying Value	$ 11.1	$ 11.1	$ 8.0