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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