Supplemental Cash Flow Disclosures - Non-Cash Investing and Financing Activities (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Disclosure Supplemental Cash Flow Disclosures Noncash Investing And Financing Activities [Abstract]
Capital property and equipment acquired on account, but not paid as of December 31	$ 64.5	$ 34.0	$ 33.3
Non Cash Performance Incentive Plan DRP	0.0	1.2	0.0
Performance Incentive Plan	$ 5.6	$ 4.9	$ 3.7