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Credit and Other Debt Agreements - Credit Agreement - Additional Information (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Jun. 22, 2023
USD ($)
Dec. 31, 2024
AUD ($)
Dec. 31, 2024
NZD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2024
AUD ($)
Dec. 31, 2024
NZD ($)
Dec. 31, 2023
USD ($)
Nov. 07, 2023
USD ($)
Debt Instrument [Line Items]                
Total liabilities       $ 44,075,600,000     $ 40,800,500,000  
Long-term debt       23,000,000.0        
Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Credit facility, term 5 years              
Line of Credit Facility, Current Borrowing Capacity $ 1,200,000,000             $ 1,700,000,000
Line of credit facility, amount outstanding       225,200,000        
Interest rate for facility   The interest rates on Facility B are Interbank rates, which vary by tranche, duration and currency, plus a margin of 1.400% and 1.850% for the AU$ and NZ$ tranches, respectively. The interest rates on Facilities C and D are 30 day Interbank rates, plus a margin of 0.830% and 0.990% for the AU$ and NZ$ tranches, respectively. The annual fee for Facility B is 0.56% and 0.8325% for the undrawn commitments for the AU$ and NZ$ tranches, respectively. The annual fee for Facility C is 0.77% and for Facility D is 0.90% of the total commitments of the facilities The interest rates on Facility B are Interbank rates, which vary by tranche, duration and currency, plus a margin of 1.400% and 1.850% for the AU$ and NZ$ tranches, respectively. The interest rates on Facilities C and D are 30 day Interbank rates, plus a margin of 0.830% and 0.990% for the AU$ and NZ$ tranches, respectively. The annual fee for Facility B is 0.56% and 0.8325% for the undrawn commitments for the AU$ and NZ$ tranches, respectively. The annual fee for Facility C is 0.77% and for Facility D is 0.90% of the total commitments of the facilities          
Debt instrument fair value amount       225,200,000        
Letter of Credit Sub-facility [Member]                
Debt Instrument [Line Items]                
Line of Credit Facility, Current Borrowing Capacity $ 75,000,000              
Credit Facility Two [Member] | Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Line of credit facility, amount outstanding         $ 350.0 $ 0.0    
Line of credit facility, remaining borrowing capacity         60.0 25.0    
Net borrowings on premium financing debt facility   $ 410.0 $ 25.0          
Credit Facility Three [Member] | Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Line of credit facility, amount outstanding         0.0      
Line of credit facility, remaining borrowing capacity         $ 60.0      
Net borrowings on premium financing debt facility   $ 390.0 $ 10.0          
Annual fee percentage   0.77% 0.77%          
Credit Facility Four [Member] | Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Line of credit facility, amount outstanding           12.5    
Line of credit facility, remaining borrowing capacity           $ 2.5    
Net borrowings on premium financing debt facility   $ 60.0 $ 15.0          
Annual fee percentage   0.90% 0.90%          
AUD Denominated Tranche [Member] | Revolving Credit Facility [Member] | Facility B [Member]                
Debt Instrument [Line Items]                
Additional margin percentage on interest rate   1.40% 1.40%          
Annual fee percentage   0.56% 0.56%          
AUD Denominated Tranche [Member] | Revolving Credit Facility [Member] | Facility C and D [Member]                
Debt Instrument [Line Items]                
Additional margin percentage on interest rate   0.83% 0.83%          
NZD Denominated Tranche [Member] | Revolving Credit Facility [Member] | Facility B [Member]                
Debt Instrument [Line Items]                
Additional margin percentage on interest rate   1.85% 1.85%          
Annual fee percentage   0.8325% 0.8325%          
NZD Denominated Tranche [Member] | Revolving Credit Facility [Member] | Facility C and D [Member]                
Debt Instrument [Line Items]                
Additional margin percentage on interest rate   0.99% 0.99%          
Note Purchase Agreements [Member] | Level 3 [Member]                
Debt Instrument [Line Items]                
Line of credit facility, fair value of amount outstanding       12,072,700,000        
Long-term debt       13,073,000,000        
Unsecured Multicurrency Credit Agreement [Member] | Standby Letters of Credit [Member]                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity       1,689,100,000        
Line of credit facility, amount outstanding       10,900,000        
Total liabilities       12,000,000        
Line of credit facility, fair value of amount outstanding       $ 0        
Unsecured Multicurrency Credit Agreement [Member] | Minimum [Member]                
Debt Instrument [Line Items]                
Interest rates on base rate loans   0.00% 0.00%          
Fixed rate over SOFR rate, eurocurrency rate or RFR rate   0.775% 0.775%          
Annual facility fee of revolving credit facility   0.10% 0.10%          
Unsecured Multicurrency Credit Agreement [Member] | Maximum [Member]                
Debt Instrument [Line Items]                
Interest rates on base rate loans   0.375% 0.375%          
Fixed rate over SOFR rate, eurocurrency rate or RFR rate   1.375% 1.375%          
Annual facility fee of revolving credit facility   0.25% 0.25%