Definite Lived Long-Lived Assets - Other Intangible Assets Subject to Amortization (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Jun. 30, 2016
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	$ 11.1	$ 11.7	$ 22.1	$ 23.6
Gross Carrying Value	608.2		608.2		$ 609.5
Accumulated Amortization	(324.3)		(324.3)		(315.5)
Net Carrying Value	283.9		$ 283.9		$ 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	165.2		$ 165.2		$ 170.6
Accumulated Amortization	(67.3)		(67.3)		(64.9)
Net Carrying Value	97.9		$ 97.9		$ 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	242.6		$ 242.6		$ 230.3
Accumulated Amortization	(95.0)		(95.0)		(90.9)
Net Carrying Value	147.6		$ 147.6		$ 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	200.4		$ 200.4		$ 208.6
Accumulated Amortization	(162.0)		(162.0)		(159.7)
Net Carrying Value	$ 38.4		$ 38.4		$ 48.9