Earnings Per Share - Schedule of Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Numerator:
Net income attributable to common shareholders	$ 646	$ 488	$ 423
Denominator:
Basic weighted average common stock	80.2	85.0	87.1
Added: Weighted average stock options/share awards	0.2	0.2	0.2
Diluted weighted average common stock	80.4	85.2	87.2
Net earnings per share - basic	$ 8.06	$ 5.74	$ 4.86
Net earnings per share - diluted	$ 8.04	$ 5.72	$ 4.85