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Shareholders' Deficit - Summary of Changes in Shareholders' Deficit (Parenthetical) (Detail) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Issuance of common shares 1.2 0.2 2.1 1.5
Repurchases of common shares 0.3   0.6 0.5
Foreign currency translation adjustment, tax $ 0.1 $ (0.2) $ 0.0 $ (0.2)
Unrealized gain (loss) on derivatives, tax $ 0.1 $ (0.1) $ 0.0 $ (0.1)
Maximum [Member]        
Repurchases of common shares   0.1