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Income Taxes - Summary of Components of Net Deferred Income Tax Asset (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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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

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