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Change in Working Capital - Summary of Change in Working Capital (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Change In Working Capital [abstract]      
Inventories $ (89.9) $ (56.2) $ 0.8
Trade and other receivables (88.0) (5.6) (0.5)
Trade and other payables 6.1 37.2 (32.2)
Total change in working capital $ (171.8) $ (24.6) $ (31.9)