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Debt Facilities - Senior Credit Facility (Detail) - Revolving credit facility borrowings
12 Months Ended
Dec. 12, 2017
GBP (£)
Dec. 31, 2018
GBP (£)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
SEK (kr)
Dec. 12, 2017
USD ($)
Dec. 12, 2017
SEK (kr)
Letter of Credit            
Debt Instrument [Line Items]            
Maximum borrowing capacity     $ 250,000,000.0      
Letter of Credit | Minimum            
Debt Instrument [Line Items]            
Margin rate (percent)   0.00%        
Quarterly facility fee (percent)   0.15%        
Letter of Credit | Maximum            
Debt Instrument [Line Items]            
Margin rate (percent)   0.40%        
Quarterly facility fee (percent)   0.30%        
Letter of Credit | LIBOR | Minimum            
Debt Instrument [Line Items]            
Variable rate (percent)   0.85%        
Letter of Credit | LIBOR | Maximum            
Debt Instrument [Line Items]            
Variable rate (percent)   1.40%        
Letter of Credit | Federal Funds Rate            
Debt Instrument [Line Items]            
Variable rate (percent)   0.50%        
Letter of Credit | One month LIBOR            
Debt Instrument [Line Items]            
Variable rate (percent)   1.00%        
Revolving Credit Facility            
Debt Instrument [Line Items]            
Maximum borrowing capacity         $ 2,000,000,000.0  
Term A Loan Facility            
Debt Instrument [Line Items]            
Maximum borrowing capacity         1,000,000,000.0  
LIne of credit outstanding £ 500,000,000.0 £ 481,300,000 $ 916,700,000 kr 2,695,000,000 997,100,000 kr 2,800,000,000.0
Repay percentage 5.00%          
Weighted average interest rate during period (percent)   1.85% 1.85% 1.85%    
Debt issuance costs, net     $ 2,300,000      
Term A Loan Facility | Minimum            
Debt Instrument [Line Items]            
Variable rate (percent) 1.00%          
Term A Loan Facility | Maximum            
Debt Instrument [Line Items]            
Variable rate (percent) 1.70%          
Senior Credit Facility [Member]            
Debt Instrument [Line Items]            
Maximum borrowing capacity         $ 3,000,000,000.0  
Debt instrument, term 5 years