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Long-Term Debt (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2019
Jun. 30, 2020
Sep. 30, 2019
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2025
Sep. 01, 2022
Aug. 31, 2022
Dec. 31, 2021
Oct. 01, 2021
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2019
Apr. 30, 1998
Debt Instrument [Line Items]                              
Accrued interest expense   $ 900,000     $ 900,000                 $ 400,000  
Credit agreement, potential increase to term loan and line of credit $ 300,000,000.0                            
Debt issuance costs 9,700,000                            
Debt issuance costs capitalized 9,600,000                            
Loss (gain) on extinguishment of debt     $ 1,500,000                        
Unamortized costs 14,600,000                            
Debt issuance costs expensed   $ 1,300,000     $ 2,493,000 $ 2,583,000                  
Derivative Instruments, Interest Rate Swaps, Percentage of Principle Balance   50.00%     50.00%                    
Liability for interest rate swap agreements                           47,700,000  
Market value adjustments on interest rate swaps, net of tax   $ (1,490,000)   $ (21,088,000) $ (38,380,000) (33,294,000)                  
Interest expense, pre-tax   5,900,000   (1,700,000) 7,200,000 (3,800,000)                  
Forecast                              
Debt Instrument [Line Items]                              
Interest expense, pre-tax to be reclassified during next 12 months                         $ 18,100,000    
Interest Rate Swap                              
Debt Instrument [Line Items]                              
Remaining notional balance   $ 1,200,000,000     $ 1,200,000,000             $ 1,200,000,000      
Derivative, average fixed interest rate   2.34%     2.34%                    
Asset for Swaps                           600,000  
Interest Rate Swap | Minimum                              
Debt Instrument [Line Items]                              
Derivative, average fixed interest rate   0.66%     0.66%                    
Interest Rate Swap | Maximum                              
Debt Instrument [Line Items]                              
Derivative, average fixed interest rate   2.98%     2.98%                    
Interest Rate Swap | Recurring                              
Debt Instrument [Line Items]                              
Asset for Swaps                           572,000  
Derivative liability   $ 98,259,000     $ 98,259,000                 47,691,000  
Interest Rate Swap | Recurring | Level 2                              
Debt Instrument [Line Items]                              
Asset for Swaps                           572,000  
Derivative liability   98,259,000     98,259,000                 $ 47,691,000  
Interest Rate Swap | Forecast                              
Debt Instrument [Line Items]                              
Remaining notional balance             $ 465,000,000.0 $ 496,800,000 $ 1,000,000,000.0   $ 1,100,000,000        
Derivative, average fixed interest rate             2.61%   2.64% 2.55%          
Swap                              
Debt Instrument [Line Items]                              
Market value adjustments on interest rate swaps, net of tax   (1,500,000)   (21,100,000) (38,400,000) (33,300,000)                  
Deferred taxes on interest rate swaps   500,000   $ 7,000,000.0 12,800,000 $ 11,100,000                  
Line of Credit Due May 2024 | Revolving line of credit                              
Debt Instrument [Line Items]                              
Multicurrency revolving sub-facility 100,000,000.0                            
Line of Credit Due May 2024 | Letter of Credit                              
Debt Instrument [Line Items]                              
Revolving credit facility, letter of credit sub-facility 50,000,000.0                            
Term loan facility | Term Loan A-1 Due May 2024                              
Debt Instrument [Line Items]                              
Term facility, maximum borrowing capacity $ 1,800,000,000                            
Term of loan facility 5 years                            
Line of Credit Due May 2024 | Revolving line of credit                              
Debt Instrument [Line Items]                              
Term facility, maximum borrowing capacity $ 750,000,000.0                            
Term of loan facility 5 years                            
Revolving line of credit, remaining borrowing capacity   750,000,000.0     750,000,000.0                    
Senior notes | 7.55% senior debentures due April 2028                              
Debt Instrument [Line Items]                              
Debt instrument, face amount                             $ 100,000,000.0
Accounts Payable and Accrued Liabilities                              
Debt Instrument [Line Items]                              
Derivative liability   $ 5,200,000     $ 5,200,000