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Long-Term Debt and Short-Term Borrowings - Revolving Credit Facility - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Letters of credit outstanding amount $ 91,800,000  
2019 Credit Agreement [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Credit Agreement applicable fixed rate spread 0.875%  
Credit Agreement applicable daily rate spread 0.00%  
2019 Credit Agreement [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Credit Agreement applicable fixed rate spread 1.25%  
Credit Agreement applicable daily rate spread 0.25%  
2019 Credit Agreement [Member] | Revolving credit facility [Member]    
Debt Instrument [Line Items]    
Amounts available to borrow under credit agreement $ 2,800,000,000  
Revolving credit facility 0  
Letters of credit outstanding amount $ 2,000,000.0  
2019 Credit Agreement [Member] | Revolving credit facility [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Credit Agreement applicable fixed rate spread 0.68%  
Credit Agreement applicable daily rate spread 0.00%  
2019 Credit Agreement [Member] | Revolving credit facility [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Credit Agreement applicable fixed rate spread 1.075%  
Credit Agreement applicable daily rate spread 0.075%  
2019 Credit Agreement [Member] | Canadian, Australian and New Zealand subsidiaries [Member]    
Debt Instrument [Line Items]    
Amounts available to borrow under credit agreement $ 200,000,000.0  
2019 Credit Agreement [Member] | U.K. subsidiaries [Member]    
Debt Instrument [Line Items]    
Amounts available to borrow under credit agreement 300,000,000.0  
2017 Credit Agreement [Member]    
Debt Instrument [Line Items]    
Amounts available to borrow under credit agreement $ 2,800,000,000  
2017 Credit Agreement [Member] | Revolving credit facility [Member]    
Debt Instrument [Line Items]    
Revolving credit facility   $ 0
Letters of credit outstanding amount   $ 2,000,000.0
2017 Credit Agreement [Member] | Revolving credit facility [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Credit Agreement applicable fixed rate spread 0.775%  
Credit Agreement applicable daily rate spread 0.00%  
2017 Credit Agreement [Member] | Revolving credit facility [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Credit Agreement applicable fixed rate spread 1.075%  
Credit Agreement applicable daily rate spread 0.075%  
2017 Credit Agreement [Member] | Canadian, Australian and New Zealand subsidiaries [Member]    
Debt Instrument [Line Items]    
Amounts available to borrow under credit agreement $ 200,000,000.0  
2017 Credit Agreement [Member] | U.K. subsidiaries [Member]    
Debt Instrument [Line Items]    
Amounts available to borrow under credit agreement $ 300,000,000.0