Parent Company Balance Sheet Captions (Detail) - USD ($) $ / shares in Units, $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Stockholders' Equity, Number of Shares, Par Value and Other Disclosure
Common Stock, Par Value (in dollars per share)	$ 0.10	$ 0.10
Common Stock, Shares Authorized	725,000,000	725,000,000
Common Stock, Shares Issued	196,194,941	195,460,723
Treasury Stock, Shares at Cost	30,500,524	16,871,752
Short-term debt	$ 0.0	$ 274.6