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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, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Issuance of common shares 0.2 0.1 1.5 1.1
Repurchases of common shares   1.1 0.5 4.1
Foreign currency translation adjustment, tax $ (0.2) $ (0.4) $ (0.2) $ (0.4)
Unrealized (loss) gain on derivatives, tax $ (0.1) $ 0.0 $ (0.1) $ 0.0
Maximum [Member]        
Repurchases of common shares 0.1