Other Nonoperating Income, Net - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Component of Other Operating Income and Expense [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]		Other Nonoperating Income (Expense)
Reduction in pension expense		$ 19.4
Other Nonoperating Income, Net
Component of Other Operating Income and Expense [Line Items]
Gain on repurchase of bond	$ 12.0
Increase in interest income	13.3
Third-party railroad track maintenance expense	$ 8.2	$ 7.7	$ 11.4