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Long-term Debt and Short-term Borrowings (Amended Maximum Consolidated Leverage Ratio) (Details) - Senior Secured Credit Facility Due March 2026 - Secured Debt
Jun. 30, 2021
Nov. 10, 2020
Line of Credit Facility [Line Items]    
Maximum consolidated leverage ratio 5.25  
March 2021    
Line of Credit Facility [Line Items]    
Maximum consolidated leverage ratio   5.25
June 2021    
Line of Credit Facility [Line Items]    
Maximum consolidated leverage ratio   5.25
September 2021    
Line of Credit Facility [Line Items]    
Maximum consolidated leverage ratio   4.75
December 2021    
Line of Credit Facility [Line Items]    
Maximum consolidated leverage ratio   4.25
March 2022    
Line of Credit Facility [Line Items]    
Maximum consolidated leverage ratio   4.25
June 2022    
Line of Credit Facility [Line Items]    
Maximum consolidated leverage ratio   4.25
September 2022 and thereafter    
Line of Credit Facility [Line Items]    
Maximum consolidated leverage ratio   3.75