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Debt Facilities - Term Loan Facility (Detail)
€ in Millions
Apr. 15, 2020
USD ($)
Apr. 15, 2020
EUR (€)
Jul. 31, 2018
USD ($)
Jul. 31, 2018
JPY (¥)
Jul. 26, 2018
JPY (¥)
Dec. 12, 2017
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
GBP (£)
Dec. 31, 2020
SEK (kr)
Dec. 31, 2020
JPY (¥)
Dec. 31, 2019
USD ($)
Jul. 31, 2018
JPY (¥)
Dec. 12, 2017
GBP (£)
Dec. 12, 2017
SEK (kr)
Short-term Debt [Line Items]                            
Long term debt, gross             $ 1,370,970,000       $ 1,370,118,000      
Senior Unsecured 364-Day Term Loan Facilities | Notes Payable to Banks                            
Short-term Debt [Line Items]                            
Aggregate principal amount $ 750,000,000.0                          
Closing Date Facility | Notes Payable to Banks                            
Short-term Debt [Line Items]                            
Aggregate principal amount 500,000,000.0                          
Delayed Draw Facility | Notes Payable to Banks                            
Short-term Debt [Line Items]                            
Aggregate principal amount 250,000,000.0                          
Closing Date Facility, Series 2 | Notes Payable to Banks                            
Short-term Debt [Line Items]                            
Amount drawn on Closing Date Facility 109,800,000 € 100.0                        
Closing Date Facility, Series 1 | Notes Payable to Banks                            
Short-term Debt [Line Items]                            
Amount drawn on Closing Date Facility $ 391,000,000.0                          
Revolving credit facility borrowings | Revolving credit facility borrowings                            
Short-term Debt [Line Items]                            
Line of credit outstanding           $ 997,100,000 $ 883,600,000 £ 431,300,000 kr 2,415,000,000.0       £ 500,000,000.0 kr 2,800,000,000
Repay percentage         5.00% 5.00%                
Debt weighted average interest rate             1.85% 1.85% 1.85% 1.85%        
Debt issuance costs, net             $ 1,200,000              
Unsecured debt | Revolving credit facility borrowings | JPY Term Loan                            
Short-term Debt [Line Items]                            
Debt issuance costs, net             2,100,000              
Aggregate principal debt amount issued     $ 424,700,000   ¥ 47,500,000,000             ¥ 47,500,000,000    
Long term debt, gross             $ 408,500,000     ¥ 42,200,000,000        
Effective interest rate (percent)             1.74% 1.74% 1.74% 1.74%        
Unsecured debt | Revolving credit facility borrowings | Japanese Yen Term Loan                            
Short-term Debt [Line Items]                            
Repayment of debt     $ 391,300,000 ¥ 43,800,000,000                    
Minimum | Revolving credit facility borrowings | Revolving credit facility borrowings                            
Short-term Debt [Line Items]                            
Variable rate (percent)         1.00% 1.00%                
Maximum | Revolving credit facility borrowings | Revolving credit facility borrowings                            
Short-term Debt [Line Items]                            
Variable rate (percent)         1.70% 1.70%