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Credit and Other Debt Agreements - Credit Agreement - Additional Information (Detail)
$ in Millions
 12 Months Ended
Jun. 07, 2019
USD ($)
Institution
Apr. 08, 2016
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
NZD ($)
Dec. 31, 2020
AUD ($)
Dec. 31, 2020
NZD ($)
Dec. 31, 2020
AUD ($)
Sep. 16, 2020
AUD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]                  
Liabilities     $ 16,098,700,000           $ 14,419,300,000
Long-term debt     19,600,000            
Revolving Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Line of credit facility, amount outstanding     $ 203,600,000            
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 1.750% for the AU$ and NZ$ tranches, respectively.  The interest rates on Facilities C and D are 30 day Interbank rates, plus a margin of 0.730% and 0.940% for the AU$ and NZ$ tranches, respectively.  The annual fee for Facility B is 0.63% and 0.7875% for the undrawn commitments for the AU$ and NZ$ tranches, respectively.  The annual fee for Facility C is 0.67% and for Facility D is 0.86% 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 1.750% for the AU$ and NZ$ tranches, respectively.  The interest rates on Facilities C and D are 30 day Interbank rates, plus a margin of 0.730% and 0.940% for the AU$ and NZ$ tranches, respectively.  The annual fee for Facility B is 0.63% and 0.7875% for the undrawn commitments for the AU$ and NZ$ tranches, respectively.  The annual fee for Facility C is 0.67% and for Facility D is 0.86% 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 1.750% for the AU$ and NZ$ tranches, respectively.  The interest rates on Facilities C and D are 30 day Interbank rates, plus a margin of 0.730% and 0.940% for the AU$ and NZ$ tranches, respectively.  The annual fee for Facility B is 0.63% and 0.7875% for the undrawn commitments for the AU$ and NZ$ tranches, respectively.  The annual fee for Facility C is 0.67% and for Facility D is 0.86% of the total commitments of the facilities        
Debt instrument fair value amount     $ 203,600,000            
Revolving Credit Facility [Member] | Before Amendment [Member]                  
Debt Instrument [Line Items]                  
Line of credit facility, maximum borrowing capacity               $ 245,000,000.0  
Revolving Credit Facility [Member] | After Amendment [Member]                  
Debt Instrument [Line Items]                  
Line of credit facility, maximum borrowing capacity               $ 310,000,000.0  
Multi Currency Credit Agreement [Member]                  
Debt Instrument [Line Items]                  
Number of financial institutions entered in unsecured multicurrency credit agreement | Institution 15                
Periodic payments of interest and principal, expiry date Jun. 07, 2024 Apr. 08, 2021              
Line of credit facility, maximum borrowing capacity $ 1,200,000,000.0 $ 800,000,000.0              
Line of credit facility, maximum amount outstanding during period     1,700,000,000.0            
Debt acquisition costs     2,500,000            
Estimated fair value of outstanding borrowings     $ 0            
Multi Currency Credit Agreement [Member] | Minimum [Member]                  
Debt Instrument [Line Items]                  
Interest rates on base rate loans     0.00% 0.00% 0.00%        
Fixed rate over LIBOR     0.85% 0.85% 0.85%        
Annual facility fee of revolving credit facility     0.15% 0.15% 0.15%        
Multi Currency Credit Agreement [Member] | Maximum [Member]                  
Debt Instrument [Line Items]                  
Interest rates on base rate loans     0.45% 0.45% 0.45%        
Fixed rate over LIBOR     1.45% 1.45% 1.45%        
Annual facility fee of revolving credit facility     0.30% 0.30% 0.30%        
Multi Currency Credit Agreement [Member] | Swing Loan [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, gross     $ 75,000,000.0            
Multi Currency Credit Agreement [Member] | Standby Letters of Credit [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, gross     75,000,000.0            
Line of credit facility, amount outstanding     17,400,000            
Liabilities     17,500,000            
Line of credit facility, fair value of amount outstanding     0            
Line of credit facility, remaining borrowing capacity     $ 1,182,600,000            
Credit Facility Two [Member] | Revolving Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Line of credit facility, amount outstanding           $ 0.0 $ 255,000,000.0    
Line of credit facility, remaining borrowing capacity           25.0 5,000,000.0    
Net borrowings on premium financing debt facility       $ 25.0 $ 260,000,000.0        
Credit Facility Three [Member] | Revolving Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Line of credit facility, amount outstanding             0.0    
Net borrowings on premium financing debt facility         $ 50,000,000.0        
Annual fee percentage     0.67% 0.67% 0.67%        
Credit Facility Four [Member] | Revolving Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Line of credit facility, amount outstanding           14.9      
Line of credit facility, remaining borrowing capacity           $ 0.1 $ 50,000,000.0    
Net borrowings on premium financing debt facility       $ 15.0          
Annual fee percentage     0.86% 0.86% 0.86%        
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% 1.40%        
Annual fee percentage     0.63% 0.63% 0.63%        
AUD Denominated Tranche [Member] | Revolving Credit Facility [Member] | Facility C and D [Member]                  
Debt Instrument [Line Items]                  
Additional margin percentage on interest rate     0.73% 0.73% 0.73%        
NZD Denominated Tranche [Member] | Revolving Credit Facility [Member] | Facility B [Member]                  
Debt Instrument [Line Items]                  
Additional margin percentage on interest rate     1.75% 1.75% 1.75%        
Annual fee percentage     0.7875% 0.7875% 0.7875%        
NZD Denominated Tranche [Member] | Revolving Credit Facility [Member] | Facility C and D [Member]                  
Debt Instrument [Line Items]                  
Additional margin percentage on interest rate     0.94% 0.94% 0.94%        
Note Purchase Agreements [Member] | Level 3 [Member]                  
Debt Instrument [Line Items]                  
Line of credit facility, fair value of amount outstanding     $ 5,018,900,000            
Long-term debt     $ 4,348,000,000.0