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Debt Obligations (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 18, 2019
Oct. 17, 2018
May 31, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
May 22, 2019
Debt Instrument [Line Items]                  
Increased in credit facility     $ 30,000,000            
Senior notes       $ 711,300   $ 711,300      
Conversion price $ 188.73                
Debt instrument, convertible, carrying amount of equity component       99,700,000   99,700,000      
Contractual interest expense       $ 1,000,000.0 $ 1,000,000.0 2,000,000.0 $ 2,000,000.0    
Debt instrument, interest rate during period 100.00%     4.40%          
Line of credit facility, expiration date   Oct. 17, 2023              
Line of credit, current       $ 800   800   $ 900,000  
Accretion Expense       4,000,000.0 $ 3,800,000 7,900,000 $ 7,500,000    
Line of Credit [Member]                  
Debt Instrument [Line Items]                  
Line of credit facility, maximum borrowing capacity       200,000,000   $ 200,000,000      
Due 2049 [Member]                  
Debt Instrument [Line Items]                  
Sale of convertible senior notes $ 525,000,000.0                
Debt instrument, interest rate during period           0.75%      
Debt instrument, unamortized discount       $ 64,900,000   $ 64,900,000      
Senior Notes, 1.375 Percent due 2026 [Member]                  
Debt Instrument [Line Items]                  
Senior notes                 $ 669,900,000
Debt instrument, interest rate during period           1.375%      
Long-term debt, percentage bearing fixed interest, percentage rate       1.375%   1.375%      
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]                  
Debt Instrument [Line Items]                  
Debt instrument, applicable margin           1.125%      
Minimum [Member] | Base Rate [Member]                  
Debt Instrument [Line Items]                  
Debt instrument, applicable margin           0.175%      
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]                  
Debt Instrument [Line Items]                  
Debt instrument, applicable margin           2.00%      
Maximum [Member] | Base Rate [Member]                  
Debt Instrument [Line Items]                  
Debt instrument, applicable margin           1.00%      
Swingline loans [Member]                  
Debt Instrument [Line Items]                  
Line of credit facility, maximum borrowing capacity       $ 50,000,000   $ 50,000,000      
Foreign Swingline Loans [Member]                  
Debt Instrument [Line Items]                  
Line of credit facility, maximum borrowing capacity       90,000,000   90,000,000      
Unsecured Debt [Member]                  
Debt Instrument [Line Items]                  
Line of credit facility, maximum borrowing capacity   $ 1,000,000,000.0              
Euro Member Countries, Euro                  
Debt Instrument [Line Items]                  
Senior notes       $ 600,000,000   $ 600,000,000      
Euro Member Countries, Euro | Senior Notes, 1.375 Percent due 2026 [Member]                  
Debt Instrument [Line Items]                  
Senior notes                 $ 600,000,000