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Income Taxes - Summary of Components of Net Deferred Income Tax Asset (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Deferred income tax assets: |  |
Tax loss carryforwards | $ 420.2 | $ 452.9
Tax credit carryforwards | 260.6 | 341.0
Retirement benefit plans | 54.2 | 58.2
Accrued liabilities | 136.9 | 144.1
Self-insurance reserves | 5.3 | 5.9
Current asset basis differences | 37.8 | 37.4
Long-term asset basis differences | (77.7) | (88.1)
Deferred compensation | 35.9 | 41.4
Recoverable customer engineering, development and tooling | 0.1 | 3.6
Undistributed earnings of foreign subsidiaries | (75.0) | (41.7)
Derivative instruments and hedging activities | 0.3 | 3.3
Other | (2.7) | (0.4)
Deferred tax assets, gross, total | 795.9 | 957.6
Valuation allowance | (350.4) | (402.2)
Net deferred income tax asset | $ 445.5 | $ 555.4

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