Income Taxes - Summary of Components of Net Deferred Income Tax Asset (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Deferred income tax assets (liabilities):
Tax loss carryforwards	$ 419.7	$ 420.2
Tax credit carryforwards	294.0	260.6
Retirement benefit plans	59.1	54.2
Accrued liabilities	136.1	136.9
Self-insurance reserves	5.8	5.3
Current asset basis differences	43.7	37.8
Long-term asset basis differences	(65.4)	(77.7)
Deferred compensation	27.2	35.9
Recoverable customer engineering, development and tooling	(10.5)
Recoverable customer engineering, development and tooling		0.1
Undistributed earnings of foreign subsidiaries	(76.7)	(75.0)
Derivative instruments and hedging activities	(5.2)
Derivative instruments and hedging activities		0.3
Other	(5.8)	(2.7)
Deferred tax assets, gross, total	822.0	795.9
Valuation allowance	(344.8)	(350.4)
Net deferred income tax asset	$ 477.2	$ 445.5