Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Employee Benefit Plan [Abstract]
Profit Sharing and Retirement Savings Plan, plan expense	$ 181.4	$ 307.9	$ 169.4
Unfunded obligation	27.0	25.5
Expense associated with early retiree medical plan	$ 2.0	$ 2.1	$ 2.2
Discount rate used to calculate benefit obligation	3.23%	4.24%	3.60%
Health care cost trend rate	6.00%	6.30%	6.60%
Projected ultimate future health care cost trend rate	4.50%
Year that trend rate is projected to reach ultimate rate	2037