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Equity Method Investments - Additional Information (Detail)
kr in Millions, $ in Millions
3 Months Ended
Apr. 18, 2017
SEK (kr)
Mar. 31, 2018
USD ($)
Mar. 31, 2018
SEK (kr)
Mar. 31, 2017
USD ($)
Apr. 18, 2017
USD ($)
Schedule Of Equity Method Investments [Line Items]          
(Loss) income from equity method investments   $ (12.7)   $ 0.5  
Zenuity          
Schedule Of Equity Method Investments [Line Items]          
Cash contribution to joint venture kr 1,000 $ 71.0 kr 600    
Ownership percentage in joint venture   50.00%     50.00%
Equity value of joint venture         $ 250.0
Share in equity value of joint venture         $ 125.0
(Loss) income from equity method investments   $ (14.0)      
Equity investments   $ 159.0      
Zenuity | Volvo Cars          
Schedule Of Equity Method Investments [Line Items]          
Ownership percentage in joint venture         50.00%