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Deferred Compensation - Additional Information (Detail) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Investments And Employee Deferred Compensation Plan [Line Items]              
Deferred Equity Participation Plan, distributions to key executives, age         age 62 (or the one-year anniversary of the date of the grant for participants over the age of 61 as of the grant date) or upon or after their actual retirement if later.    
Deferred Equity Participation Sub-plans, distributions requisite service description         we annually make awards under sub-plans of the DEPP for certain production staff, which generally provide for vesting and/or distributions no sooner than five years from the date of awards, although certain awards vest and/or distribute after the earlier of fifteen years or the participant reaching age 65.    
Deferred Equity Participation Sub-plans, distributions to key executives, age         age 65    
Deferred Equity Participation Plan (DEPP) [Member]              
Investments And Employee Deferred Compensation Plan [Line Items]              
Awards approved by committee, value   $ 23.2   $ 25.1      
Charge to compensation expenses related to awards $ 5.6   $ 5.9   $ 9.6 $ 9.9  
Unearned deferred compensation, value         $ 95.5   $ 81.1
Unearned deferred compensation, shares         2.3   2.2
Total intrinsic value of unvested equity based awards         $ 584.4   $ 504.9
Cash and equity awards with aggregate fair value vested and distributed to participants         17.9 9.4  
Deferred Equity Participation Plan Sub Plans [Member]              
Investments And Employee Deferred Compensation Plan [Line Items]              
Awards approved by committee, value   2.3   3.0      
Charge to compensation expenses related to awards 0.6   0.8   1.1 1.4  
Distributions from the sub-plans         2.3 6.4  
Deferred Cash Participation Plan (DCPP) [Member]              
Investments And Employee Deferred Compensation Plan [Line Items]              
Awards approved by committee, value   $ 8.1   $ 9.8      
Charge to compensation expenses related to awards $ 5.1   $ 4.2   9.9 8.0  
Cash and equity awards with aggregate fair value vested and distributed to participants         $ 13.6 $ 19.5