Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) reportable_operating_segment	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Accounting Policies [Abstract]
Allowance for doubtful accounts	$ 33.2	$ 41.8
Capitalized pre-production E&D costs	230.6	257.4
Capitalized pre-production tooling costs related to customer-owned tools	198.1	115.4
Cash collected related to E&D and tooling costs	487.5	311.1
Depreciation expense	433.0	380.1	$ 325.2
Capital expenditures recorded in accounts payable	156.2	119.7	117.8
Intangible assets fully amortized		17.0
Restructuring Cost and Reserve [Line Items]
Restructuring charges	88.0	70.9	63.6
Fixed asset impairment charges	1.4	2.1	0.7
Contract liabilities	0.0
Contract liabilities recognized in revenue	0.0
Engineering and development costs	153.5	147.9	143.7
Tax benefit adjustment to the provisional income tax expense	5.3
Tax benefit (expense) related to one-time transition tax on offshore earnings	15.1	(115.9)
Tax expense related to the remeasurement of the deferred tax balances	(9.8)	(52.3)
Foreign currency transaction losses	$ 14.4	5.1	7.6
Number of reportable operating segments | reportable_operating_segment	2
Previously Reported
Restructuring Cost and Reserve [Line Items]
Tax benefit (expense) related to one-time transition tax on offshore earnings		(131.0)
Tax expense related to the remeasurement of the deferred tax balances		(42.5)
Asset impairments
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 4.7	$ 1.3	$ 4.7