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Financing Arrangements and Debt (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2021
Mar. 31, 2021
Sep. 30, 2021
Sep. 30, 2020
Nov. 04, 2021
Aug. 05, 2021
Line of Credit Facility [Line Items]            
Early redemption of debt cost     $ 36,756,000 $ 0    
6.375% notes due July 2028            
Line of Credit Facility [Line Items]            
Debt instrument, face amount   $ 550,000,000        
Stated interest rate   6.375%        
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      
Early redemption of debt cost     34,200,000      
6.875% notes due 2024            
Line of Credit Facility [Line Items]            
Stated interest rate           6.875%
Loss on extinguishment of debt $ (3,500,000)          
Early redemption of debt cost $ 2,600,000          
Partial redemption           $ 150,000,000
6.875% notes due 2024 | Subsequent Event            
Line of Credit Facility [Line Items]            
Stated interest rate         6.875%  
Partial redemption         $ 150,000,000  
2018 Revolving Credit Facility            
Line of Credit Facility [Line Items]            
Amount outstanding     $ 0      
Interest rate     1.78%      
2018 Revolving Credit Facility | Letter of Credit            
Line of Credit Facility [Line Items]            
Credit facility maximum borrowing capacity     $ 1,600,000,000      
Amount outstanding     $ 31,400,000