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Income Taxes - Summary of Components of Net Deferred Income Tax Asset (Detail) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
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Deferred income tax assets: |  |
Tax loss carryforwards | $ 559.8 | $ 588.9
Tax credit carryforwards | 326.0 | 419.0
Retirement benefit plans | 100.6 | 119.8
Accrued liabilities | 131.8 | 136.7
Self-insurance reserves | 7.8 | 8.6
Current asset basis differences | 42.9 | 38.7
Long-term asset basis differences | (88.6) | (48.7)
Deferred compensation | 58.0 | 48.3
Recoverable customer engineering, development and tooling | (9.5) | (12.1)
Undistributed earnings of foreign subsidiaries | (50.6) | (54.2)
Derivative instruments and hedging activities | 16.0 | 12.5
Other | 1.9 | 1.4
Deferred tax assets, gross, total | 1,096.1 | 1,258.9
Valuation allowance | (495.7) | (508.5)
Net deferred income tax asset | $ 600.4 | $ 750.4

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