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Debt - Additional Information (Detail)
1 Months Ended 12 Months Ended
Jan. 21, 2019
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
EUR (€)
Dec. 31, 2017
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2020
GBP (£)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
EUR (€)
Nov. 30, 2016
GBP (£)
Oct. 31, 2016
EUR (€)
Aug. 31, 2015
USD ($)
Jun. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Dec. 31, 2011
CHF (SFr)
Sep. 30, 2010
GBP (£)
Dec. 31, 2007
USD ($)
Debt Instrument [Line Items]                                  
Maturities of long-term debt outstanding in 2022   $ 0                              
Maturities of long-term debt outstanding in 2023   0                              
Maturities of long-term debt outstanding in 2024   300,000,000.0                              
Maturities of long-term debt outstanding in 2025   425,000,000.0                       $ 300,000,000      
Maturities of long-term debt outstanding in 2026   466,800,000                              
Maturities of long-term debt outstanding in 2027 and thereafter   1,089,600,000                              
Debt Instrument, Face Amount | €                     € 200,000,000            
Interest rate on senior notes               6.30%     1.53%            
Total borrowing capacity under revolving credit facility   $ 850,000,000                              
Revolving credit facility expiration period   5 years                              
Weighted average interest rate on total debt borrowings outstanding   3.00%           3.50%                  
Revolving Credit Facility Borrowings                                  
Debt Instrument [Line Items]                                  
Total borrowing capacity under revolving credit facility   $ 1,500,000,000                              
Additional borrowing capacity under revolving credit facility   500,000,000                              
Available borrowing capacity under revolving credit facility   1,897,700,000                              
Borrowings outstanding   $ 72,100,000           $ 384,800,000                  
Percentage of weighted average interest rate on revolving credit facility   1.84%           1.13%                  
Revolving Credit Facility Borrowings | Letter of Credit                                  
Debt Instrument [Line Items]                                  
Borrowings outstanding   $ 30,200,000           $ 34,900,000                  
Accordion Feature                                  
Debt Instrument [Line Items]                                  
Available borrowing capacity under revolving credit facility   500,000,000                              
Foreign Subsidiaries                                  
Debt Instrument [Line Items]                                  
Available borrowing capacity under revolving credit facility   53,000,000.0           52,200,000                  
Borrowings outstanding   0           $ 9,200,000                  
Swiss franc 2.44% senior note due December 2021                                  
Debt Instrument [Line Items]                                  
Debt Instrument, Face Amount   62,200,000                         SFr 55,000,000    
Interest rate on senior notes                             2.44%    
Senior Notes                                  
Debt Instrument [Line Items]                                  
Debt Instrument, Face Amount     $ 575,000,000           € 75,000,000                
Proceeds from funding $ 100,000,000   $ 475,000,000 € 75,000,000 $ 85,100,000                        
Weighted average interest rate     3.93%           3.93%                
Senior Notes | 1.34% Due October 2026                                  
Debt Instrument [Line Items]                                  
Debt Instrument, Face Amount   366,800,000                 € 300,000,000            
Interest rate on senior notes                     1.34%            
Senior Notes | 1.53% Due October 2028                                  
Debt Instrument [Line Items]                                  
Debt Instrument, Face Amount   244,600,000                              
Senior Notes | 2.59% Due November 2028                                  
Debt Instrument [Line Items]                                  
Debt Instrument, Face Amount   204,900,000               £ 150,000,000              
Interest rate on senior notes                   2.59%              
Senior Notes | 2.70% Due November 2031                                  
Debt Instrument [Line Items]                                  
Debt Instrument, Face Amount   $ 102,400,000               £ 75,000,000              
Interest rate on senior notes                   2.70%              
6.30% Senior Notes Due December 2019                                  
Debt Instrument [Line Items]                                  
Debt Instrument, Face Amount                                 $ 100,000,000
Interest rate on senior notes                                 6.30%
British pound 4.68% senior note due September 2020                                  
Debt Instrument [Line Items]                                  
Debt Instrument, Face Amount           $ 106,400,000 £ 80,000,000                 £ 80,000,000  
Interest rate on senior notes           4.68% 4.68%                    
U.S. dollar 3.73% senior notes due September 2024                                  
Debt Instrument [Line Items]                                  
Interest rate on senior notes                           3.73%      
U.S. dollar 3.83% senior notes due September 2026                                  
Debt Instrument [Line Items]                                  
Debt Instrument, Face Amount                           $ 100,000,000      
Interest rate on senior notes                           3.83%      
U.S. dollar 3.98% senior notes due September 2029                                  
Debt Instrument [Line Items]                                  
Interest rate on senior notes                           3.98%      
U.S. dollar 3.91% senior notes due June 2025                                  
Debt Instrument [Line Items]                                  
Debt Instrument, Face Amount                         $ 50,000,000        
Interest rate on senior notes                         3.91%        
U.S. dollar 3.96% senior notes due August 2025                                  
Debt Instrument [Line Items]                                  
Debt Instrument, Face Amount                       $ 100,000,000          
Interest rate on senior notes                       3.96%          
U.S. dollar 4.45% senior notes due August 2035                                  
Debt Instrument [Line Items]                                  
Debt Instrument, Face Amount                       $ 50,000,000          
Interest rate on senior notes                       4.45%