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Royalties Paid - Summary of Royalties Paid (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Royalty Payment [abstract]      
Amount owing at beginning of the year $ (13.9) $ (12.5) $ (16.3)
Royalties (105.0) (73.7) (62.5)
Amount owing at end of the year 17.7 13.9 12.5
Translation (1.3) 0.0 0.8
Total royalties paid $ (102.5) $ (72.3) $ (65.5)