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Credit Arrangements - Summary of Credit Facilities (Detail)
9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2019
GBP (£)
Revolving credit facility [Member]    
Line Of Credit Facility [Line Items]    
Facility $ 1,500,000,000  
Interest Rate Description LIBOR in the relevant currency borrowed plus a margin of 1.50%    at September 30, 2019  
Revolving credit facility [Member] | LIBOR [Member]    
Line Of Credit Facility [Line Items]    
Rate 1.50% 1.50%
Receivables Financing Facility [Member]    
Line Of Credit Facility [Line Items]    
Facility $ 25,000,000  
Interest Rate Description LIBOR Market Index Rate (2.02% at September 30, 2019) plus 0.90%  
Receivables Financing Facility [Member] | LIBOR [Member]    
Line Of Credit Facility [Line Items]    
Rate 2.02% 2.02%
Interest Rate spread on base rate 0.90%  
General Banking Facility [Member]    
Line Of Credit Facility [Line Items]    
Facility $ 12,000,000 £ 10,000,000
Interest Rate Description Bank’s base rate of 0.75% at September 30, 2019 plus 1%  
General Banking Facility [Member] | Base Rate [Member]    
Line Of Credit Facility [Line Items]    
Rate 0.75% 0.75%
Interest Rate spread on base rate 1.00%