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Long-Term Indebtedness (Narrative) (Details)
6 Months Ended
Dec. 07, 2021
USD ($)
May 13, 2021
USD ($)
tradingDay
Dec. 19, 2019
Mar. 29, 2019
USD ($)
Dec. 14, 2018
USD ($)
Apr. 27, 2016
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Feb. 24, 2014
USD ($)
Line of Credit Facility                    
Long-term indebtedness             $ 1,101,787,000   $ 1,231,959,000  
Proceeds from issuance of convertible notes             $ 0 $ 460,000,000    
Percentage of equity interests of controlled foreign corporations (up to)             65.00%      
Level 1                    
Line of Credit Facility                    
Convertible debt, fair value             $ 415,200,000      
Term Loan                    
Line of Credit Facility                    
Debt, face amount $ 400,000,000                  
Term Loan | Period one                    
Line of Credit Facility                    
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed 1.25%                  
Debt term     2 years              
Term Loan | Period two                    
Line of Credit Facility                    
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed 1.875%                  
Term Loan | Period three                    
Line of Credit Facility                    
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed 2.50%                  
Convertible Notes                    
Line of Credit Facility                    
Debt, face amount   $ 460,000,000                
Stated interest rate   1.125%                
Proceeds from issuance of convertible notes   $ 447,800,000                
Debt, conversion ratio   0.0060369                
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                    
Letter of credit             29,400,000      
Remaining availability under the facilities             $ 286,700,000      
Commitment fee percentage             0.175%      
JPMorgan Chase Bank And Wells Fargo Bank | Line of Credit | Minimum                    
Line of Credit Facility                    
Commitment fee percentage             0.15%      
JPMorgan Chase Bank And Wells Fargo Bank | Line of Credit | Maximum                    
Line of Credit Facility                    
Commitment fee percentage             0.225%      
JPMorgan Chase Bank And Wells Fargo Bank | Letter of Credit                    
Line of Credit Facility                    
Maximum borrowings under line of credit           $ 50,000,000        
Prudential Investment Management Inc | Line of Credit                    
Line of Credit Facility                    
Long-term indebtedness       $ 50,000,000 $ 400,000,000          
Remaining availability under the facilities                   $ 200,000,000
Debt term       3 years            
Interest rate during period       3.80%            
Prudential Investment Management Inc | Line of Credit | New Term Loan, Amendment No. 4                    
Line of Credit Facility                    
Long-term indebtedness $ 400,000,000                  
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         $ 600,000,000          
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             0.125%      
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, N.A., Wells Fargo Bank, N.A., Bank of America, N.A., and 1st Source Bank | Line of Credit | LIBOR                    
Line of Credit Facility                    
Basis spread on variable rate             1.125%      
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                    
Basis spread on variable 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%