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Credit and Other Debt Agreements - Credit Agreement - Additional Information (Detail)
$ in Millions, $ in Millions, $ in Millions
 12 Months Ended
Jun. 07, 2019
Institution
Apr. 08, 2016
USD ($)
Dec. 31, 2019
AUD ($)
Dec. 31, 2019
NZD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
NZD ($)
Dec. 31, 2019
USD ($)
Aug. 15, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]                  
Liabilities             $ 14,419.3   $ 11,764.3
Long-term debt             18.5    
Revolving Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Interest rate for facility     The interest rates on Facility B are Interbank rates, which vary by tranche, duration and currency, plus a margin of 1.10% and 1.15% for the AU$ and NZ$ tranches, respectively. The interest rates on Facilities C and D are 30 day Interbank rates, plus a margin of 0.575% and 0.600% for the AU$ and NZ$ tranches, respectively. The annual fee for Facility B is 0.495% and 0.5175% for the undrawn commitments for the AU$ and NZ$ tranches, respectively. The annual fee for Facility C is 0.525% and for Facility D is 0.55% 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 1.10% and 1.15% for the AU$ and NZ$ tranches, respectively. The interest rates on Facilities C and D are 30 day Interbank rates, plus a margin of 0.575% and 0.600% for the AU$ and NZ$ tranches, respectively. The annual fee for Facility B is 0.495% and 0.5175% for the undrawn commitments for the AU$ and NZ$ tranches, respectively. The annual fee for Facility C is 0.525% and for Facility D is 0.55% 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 1.10% and 1.15% for the AU$ and NZ$ tranches, respectively. The interest rates on Facilities C and D are 30 day Interbank rates, plus a margin of 0.575% and 0.600% for the AU$ and NZ$ tranches, respectively. The annual fee for Facility B is 0.495% and 0.5175% for the undrawn commitments for the AU$ and NZ$ tranches, respectively. The annual fee for Facility C is 0.525% and for Facility D is 0.55% of the total commitments of the facilities.        
Debt instrument fair value amount             170.6    
Revolving Credit Facility [Member] | Before Amendment [Member]                  
Debt Instrument [Line Items]                  
Line of credit facility, maximum borrowing capacity               $ 185.0  
Revolving Credit Facility [Member] | After Amendment [Member]                  
Debt Instrument [Line Items]                  
Line of credit facility, maximum borrowing capacity               $ 245.0  
Credit Facility Two [Member] | Revolving Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Line of credit facility, amount outstanding     $ 205.0     $ 0.0      
Line of credit facility, remaining borrowing capacity     0.0     25.0      
Net borrowings on premium financing debt facility     205.0 $ 25.0          
Credit Facility Two [Member] | Revolving Credit Facility [Member] | Minimum [Member]                  
Debt Instrument [Line Items]                  
Increase in premium financing debt facility     160.0            
Credit Facility Three [Member] | Revolving Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Line of credit facility, amount outstanding     27.1            
Line of credit facility, remaining borrowing capacity     12.9     0.3      
Net borrowings on premium financing debt facility     $ 40.0            
Annual fee percentage     0.525% 0.525% 0.525%        
Credit Facility Four [Member] | Revolving Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Line of credit facility, amount outstanding           14.7      
Line of credit facility, remaining borrowing capacity     $ 12.9     $ 0.3      
Net borrowings on premium financing debt facility       $ 15.0          
Annual fee percentage     0.55% 0.55% 0.55%        
Multi Currency Credit Agreement [Member]                  
Debt Instrument [Line Items]                  
Number of financial institutions entered in unsecured multicurrency credit agreement | Institution 15                
Line of credit facility, maximum amount outstanding during period         $ 1,700.0        
Debt acquisition costs         $ 2.5        
Estimated fair value of outstanding borrowings             520.0    
Multi Currency Credit Agreement [Member] | Minimum [Member]                  
Debt Instrument [Line Items]                  
Debt instrument, maturity date   Apr. 08, 2021              
Line of credit facility, maximum borrowing capacity   $ 800.0              
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]                  
Debt instrument, maturity date   Jun. 07, 2024              
Line of credit facility, maximum borrowing capacity   $ 1,200.0              
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             75.0    
Multi Currency Credit Agreement [Member] | Standby Letters of Credit [Member]                  
Debt Instrument [Line Items]                  
Long-term debt, gross             75.0    
Line of credit facility, amount outstanding             16.2    
Liabilities             16.5    
Line of credit facility, fair value of amount outstanding             520.0    
Line of credit facility, remaining borrowing capacity             663.8    
Note Purchase Agreements [Member] | Level 3 [Member]                  
Debt Instrument [Line Items]                  
Line of credit facility, fair value of amount outstanding             4,254.2    
Long-term debt             $ 3,923.0    
Line Of Credit Facility Five [Member] | Revolving Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Date of expire     Jan. 31, 2019 Jan. 31, 2019 Jan. 31, 2019        
Line Of Credit Facility Five [Member] | Revolving Credit Facility [Member] | Maximum [Member]                  
Debt Instrument [Line Items]                  
Increase in premium financing debt facility     $ 190.0            
AUD Denominated Tranche [Member] | Revolving Credit Facility [Member] | Facility B [Member]                  
Debt Instrument [Line Items]                  
Additional margin percentage on interest rate     1.10% 1.10% 1.10%        
Annual fee percentage     0.495% 0.495% 0.495%        
AUD Denominated Tranche [Member] | Revolving Credit Facility [Member] | Facility C And Facility D [Member]                  
Debt Instrument [Line Items]                  
Additional margin percentage on interest rate     0.575% 0.575% 0.575%        
NZD Denominated Tranche [Member] | Revolving Credit Facility [Member] | Facility B [Member]                  
Debt Instrument [Line Items]                  
Additional margin percentage on interest rate     1.15% 1.15% 1.15%        
Annual fee percentage     0.5175% 0.5175% 0.5175%        
NZD Denominated Tranche [Member] | Revolving Credit Facility [Member] | Facility C And Facility D [Member]                  
Debt Instrument [Line Items]                  
Additional margin percentage on interest rate     0.60% 0.60% 0.60%