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Long-Term Indebtedness (Narrative) (Details)
$ / shares in Units, € in Millions
6 Months Ended
May 13, 2021
USD ($)
tradingDay
$ / shares
Dec. 19, 2019
USD ($)
Mar. 29, 2019
USD ($)
Dec. 14, 2018
USD ($)
Apr. 27, 2016
USD ($)
Mar. 20, 2015
USD ($)
Jun. 30, 2021
USD ($)
$ / shares
Jun. 30, 2020
USD ($)
Jun. 30, 2021
EUR (€)
Dec. 31, 2020
USD ($)
Nov. 11, 2019
USD ($)
Feb. 24, 2014
USD ($)
Line of Credit Facility                        
Long-term indebtedness             $ 941,824,000     $ 720,418,000    
Borrowings             1,007,704,000     $ 738,249,000    
Remaining availability under the facilities             522,600,000          
Proceeds from issuance of convertible notes             $ 460,000,000 $ 0        
Percentage of equity interests of controlled foreign corporations (up to)             65.00%          
Level 1                        
Line of Credit Facility                        
Convertible debt, fair value             $ 470,400,000          
Term Loan                        
Line of Credit Facility                        
Debt, face amount   $ 300,000,000.0                    
Term Loan | Period one                        
Line of Credit Facility                        
Debt term   2 years                    
Stated interest rate   1.25%                    
Term Loan | Period two                        
Line of Credit Facility                        
Stated interest rate   1.875%                    
Convertible Notes                        
Line of Credit Facility                        
Debt, face amount $ 460,000,000.0                      
Stated interest rate 1.125%                      
Proceeds from issuance of convertible notes $ 448,200,000                      
Debt, conversion ratio 0.0060369                      
Conversion price | $ / shares $ 165.65           $ 165.65          
Redemption price, percentage 100.00%                      
Amount of principal held 25.00%                      
Convertible Notes | Period one                        
Line of Credit Facility                        
Threshold trading days | tradingDay 20                      
Threshold consecutive trading days | tradingDay 30                      
Threshold percentage of stock price trigger 130.00%                      
Convertible Notes | Period two                        
Line of Credit Facility                        
Threshold percentage of stock price trigger 98.00%                      
JPMorgan Chase Bank And Wells Fargo Bank | Line of Credit                        
Line of Credit Facility                        
Maximum borrowings under line of credit         $ 325,000,000.0              
Long-term indebtedness       $ 250,000,000.0                
Borrowings             $ 164,500,000   € 138.0      
Letter of credit             2,800,000          
Remaining availability under the facilities             $ 372,600,000          
JPMorgan Chase Bank And Wells Fargo Bank | Line of Credit | LIBOR                        
Line of Credit Facility                        
Basis spread on variable rate             1.00%          
Prudential Investment Management Inc | Line of Credit                        
Line of Credit Facility                        
Long-term indebtedness     $ 50,000,000.0     $ 50,000,000.0         $ 200,000,000.0  
Remaining availability under the facilities                       $ 150,000,000.0
Interest rate during period     3.80%     3.35%            
Debt term     3 years     5 years            
JPMorgan Chase Bank, N.A., Wells Fargo Bank, N.A., Bank of America, N.A., and 1st Source Bank | Line of Credit                        
Line of Credit Facility                        
Maximum borrowings under line of credit   $ 900,000,000.0   $ 600,000,000.0                
Line of Credit Facility, Additional Maximum Borrowing Capacity Upon Approval   $ 300,000,000.0                    
JPMorgan Chase Bank, N.A., Wells Fargo Bank, N.A., Bank of America, N.A., and 1st Source Bank | Line of Credit | Federal Funds Effective Rate                        
Line of Credit Facility                        
Basis spread on variable rate       0.50%                
Option One | JPMorgan Chase Bank, N.A., Wells Fargo Bank, N.A., Bank of America, N.A., and 1st Source Bank | Line of Credit | LIBOR                        
Line of Credit Facility                        
Debt instrument, additional margin interest rate             0.375%          
Option One | JPMorgan Chase Bank, N.A., Wells Fargo Bank, N.A., Bank of America, N.A., and 1st Source Bank | Line of Credit | LIBOR | Minimum                        
Line of Credit Facility                        
Debt instrument, additional margin interest rate         0.00%              
Option One | JPMorgan Chase Bank, N.A., Wells Fargo Bank, N.A., Bank of America, N.A., and 1st Source Bank | Line of Credit | LIBOR | Maximum                        
Line of Credit Facility                        
Debt instrument, additional margin interest rate       0.625%                
Option Two | JPMorgan Chase Bank And Wells Fargo Bank | Line of Credit | LIBOR                        
Line of Credit Facility                        
Debt instrument, additional margin interest rate             1.375%          
Option Two | JPMorgan Chase Bank, N.A., Wells Fargo Bank, N.A., Bank of America, N.A., and 1st Source Bank | Line of Credit | LIBOR | Minimum                        
Line of Credit Facility                        
Debt instrument, additional margin interest rate       0.875%                
Option Two | JPMorgan Chase Bank, N.A., Wells Fargo Bank, N.A., Bank of America, N.A., and 1st Source Bank | Line of Credit | LIBOR | Maximum                        
Line of Credit Facility                        
Debt instrument, additional margin interest rate       1.625%