Fair Value Measurement - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2017	Mar. 31, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of earn-out liability	$ 14.0	$ 14.0		$ 14.0
Other operating income from earn out liability adjustment		13.0
Amortization of intangibles the consolidated statement of net income	8.8		$ 12.2	38.0	$ 32.0
M/A-COM Automotive Solutions Business
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Net impact of the impairment charge largely offset by the reduced earn-out liability		1.0
M/A-COM Automotive Solutions Business | Customer Contract
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortization of intangibles the consolidated statement of net income		$ 12.0
Remaining fair value of intangible asset	1.0			1.0
Other non-operating items, net
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative instruments not designated as hedging instruments	(0.9)		(1.3)	(0.5)	(0.2)
Designated as Hedging Instrument
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Gains and losses reclassified from OCI and recognized in Consolidated Statements of Net Income, net	1.4		0.1	4.6	0.3
Gains or losses expected to be reclassified from OCI and recognized in consolidated statements of net income within the next twelve months				(2.0)
Designated as Hedging Instrument | Foreign Exchange Forward | Cash Flow Hedging
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Unrealized gain (loss) recognized in consolidated statements of net income	$ (2.5)		$ 1.3	$ (5.5)	$ 4.0