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Financing Arrangements and Debt (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2022
Jun. 30, 2021
Aug. 01, 2022
Jul. 20, 2022
Jun. 02, 2022
May 02, 2022
Line of Credit Facility [Line Items]                  
Early redemption of debt cost       $ 3,438,000 $ 34,177,000        
Subsequent event                  
Line of Credit Facility [Line Items]                  
Partial redemption           $ 200,000,000      
6.875% notes due 2024                  
Line of Credit Facility [Line Items]                  
Partial redemption               $ 200,000,000  
Stated interest rate                 6.875%
Cost of debt extinguishment $ 4,300,000     4,300,000          
Early redemption of debt cost       $ 3,400,000          
6.875% notes due 2024 | Subsequent event                  
Line of Credit Facility [Line Items]                  
Partial redemption             $ 42,400,000    
6.375% notes due July 2028                  
Line of Credit Facility [Line Items]                  
Stated interest rate     6.375%            
Debt instrument, face amount     $ 550,000,000            
Transaction costs     $ 8,100,000            
4.00% notes due June 2022                  
Line of Credit Facility [Line Items]                  
Stated interest rate     4.00%            
Repayments of debt     $ 259,300,000            
4.95% notes due December 2022                  
Line of Credit Facility [Line Items]                  
Stated interest rate     4.95%            
Repayments of debt     $ 317,100,000            
3.70% notes due 2022                  
Line of Credit Facility [Line Items]                  
Stated interest rate     3.70%            
4.00%, and 4.95% Notes due 2022                  
Line of Credit Facility [Line Items]                  
Cost of debt extinguishment   $ 36,900,000     36,900,000        
Early redemption of debt cost         $ 34,200,000        
5.75% notes due August 2025                  
Line of Credit Facility [Line Items]                  
Stated interest rate 5.75%     5.75%          
5.875% notes due December 2027                  
Line of Credit Facility [Line Items]                  
Stated interest rate 5.875%     5.875%          
2018 Revolving Credit Facility                  
Line of Credit Facility [Line Items]                  
Amount outstanding $ 0     $ 0          
Interest rate       3.46%          
2018 Revolving Credit Facility | Letter of Credit                  
Line of Credit Facility [Line Items]                  
Credit facility maximum borrowing capacity 1,600,000,000     $ 1,600,000,000          
Amount outstanding $ 27,600,000     $ 27,600,000