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Schedule of Effect of Derivative Instruments in Statement of Operations Recognized (Parenthetical) (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jul. 01, 2018
Jun. 30, 2019
Jul. 01, 2018
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (losses) on foreign currency transactions $ 1.3 $ 1.9 $ 1.9 $ 2.5