Definite Lived Long-Lived Assets - Other Intangible Assets Subject to Amortization (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Mar. 31, 2021	Jun. 30, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value		$ 1,454.2	$ 1,441.7
Accumulated Amortization		(619.4)	(553.0)
Net Carrying Value		$ 834.8	888.7
Core technology [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Life	19 years	19 years
Gross Carrying Value		$ 139.9	134.5
Accumulated Amortization		(91.9)	(83.0)
Net Carrying Value		$ 48.0	51.5
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Life	14 years	14 years
Gross Carrying Value		$ 1,015.1	1,021.3
Accumulated Amortization		(286.4)	(248.0)
Net Carrying Value		$ 728.7	773.3
Product Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Life	11 years	11 years
Gross Carrying Value		$ 280.2	270.4
Accumulated Amortization		(233.8)	(217.5)
Net Carrying Value		$ 46.4	52.9
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Life	5 years	5 years
Gross Carrying Value		$ 19.0	15.5
Accumulated Amortization		(7.3)	(4.5)
Net Carrying Value		$ 11.7	$ 11.0