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Derivative Financial Instruments - Summary of Fair Value of Derivative Financial Instruments (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Assets      
Current portion $ 5.4 $ 29.5 $ 21.0
Non-current 4.1 4.8 11.1
Liabilities      
Current portion (8.1) (8.8) $ (8.4)
Non-current   (0.1)  
Net derivative financial instruments $ 1.4 $ 25.4