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Shareholders' Deficit - Summary of Changes in Shareholders' Deficit (Parenthetical) (Detail) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Issuance of common shares 0.1 0.1 2.1 1.6
Repurchases of common shares 0.0 0.0 0.6 0.5
Foreign currency translation adjustment, tax $ (0.1) $ (0.3) $ (0.1) $ (0.5)
Unrealized gain (loss) on derivatives, tax $ 0.0 $ 0.0 $ 0.0 $ (0.1)