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Employee Benefits - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Qualified employees maximum contribution to defined contribution savings plan allowed in percentage of annual compensation	75.00%
Company contribution, percentage company contribution matches of the employee's percentage contribution matched	100.00%
Employee retirement savings plan matching expenses	$ 211.0	$ 213.0	$ 192.0
Vesting service period for defined benefit pension plan	3 years
Global Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Asset allocation for the company's qualified pension plan	30.00%
Domestic Mid-Small Cap Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Asset allocation for the company's qualified pension plan	5.00%
Emerging Markets Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Asset allocation for the company's qualified pension plan	5.00%
Real Estate Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Asset allocation for the company's qualified pension plan	10.00%
Long-duration bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Asset allocation for the company's qualified pension plan	35.00%
Hedge Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Asset allocation for the company's qualified pension plan	5.00%
Private Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Asset allocation for the company's qualified pension plan	10.00%
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Company contributions to qualified pension and postretirement welfare plan	$ 28.0	26.0
Plan assets measured at fair value	7,375.0	8,113.0	$ 7,498.0
Pension Plans [Member] \| Nonqualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Company contributions to qualified pension and postretirement welfare plan	26.0
Company contributions to pension and postretirement welfare plan in next fiscal year	26.0
Pension Plans [Member] \| Hedge Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at fair value	451.0	450.0
Pension Plans [Member] \| Private Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at fair value	1,028.0	814.0
Management Arrangement With Related Party [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at fair value	$ 87.8	$ 55.3