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Royalties Paid - Summary of Royalties Paid (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of Royalty Payment [abstract]      
Amount owing at beginning of the year [1] $ (12.5) $ (16.3) $ (19.8)
Royalties [1] (73.7) (62.5) (62.0)
Amount owing at end of the year [1] 13.9 12.5 16.3
Translation [1]   0.8 (0.5)
Total royalties paid [1] $ (72.3) $ (65.5) $ (66.0)
[1] Refer note 42.