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Marketable securities - Schedule of Marketable Securities (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Marketable securities [Line Items]    
Market value, current $ 31.7 $ 56.1
Market value, noncurrent 5.5 4.8
Current Assets    
Marketable securities [Line Items]    
Market value, current 31.7 56.1
Cost or amortized cost 31.7 56.1
Unrealized loss, net 0.0 0.0
Non Current Assets    
Marketable securities [Line Items]    
Market value, noncurrent 5.5 4.8
Cost or amortized cost 5.5 5.0
Unrealized loss, net $ 0.0 $ (0.2)