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Income Taxes - Summary of Components of Net Deferred Income Tax Asset (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred income tax assets |  |
Tax loss carryforwards | $ 452.9 | $ 485.1
Tax credit carryforwards | 341.0 | 187.9
Retirement benefit plans | 58.2 | 89.4
Accrued liabilities | 144.1 | 158.2
Self-insurance reserves | 5.9 | 8.4
Current asset basis differences | 37.4 | 44.6
Long-term asset basis differences | (88.1) | (77.3)
Deferred compensation | 41.4 | 57.3
Recoverable customer engineering, development and tooling | 3.6 |
Recoverable customer engineering, development and tooling |  | (6.9)
Undistributed earnings of foreign subsidiaries | (41.7) | (62.4)
Derivative instruments and hedging activities | 3.3 | 20.1
Other | (0.4) |
Other |  | 0.6
Deferred tax assets, gross, total | 957.6 | 905.0
Valuation allowance | (402.2) | (445.6)
Net deferred income tax asset | $ 555.4 | $ 459.4

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