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FINANCING ARRANGEMENTS - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Debt fair value $ 1,600,000,000 $ 1,600,000,000
Available to borrow and outstanding letters of credit 270,200,000  
Outstanding letters of credit $ 121,300,000  
Effective interest rate percentage 4.67%  
Interest rate swap, liability $ 28,100,000 33,600,000
Interest Rate Swap    
Debt Instrument [Line Items]    
Notional amount of interest rate swap agreements $ 350,000,000.0  
Interest rate percentage 2.92%  
Term Loans with Interest Rate Swap Agreements    
Debt Instrument [Line Items]    
Debt outstanding $ 350,000,000.0  
Revolving Credit Facility | Line of Credit    
Debt Instrument [Line Items]    
Revolving credit facility maximum borrowing capacity $ 400,000,000.0 $ 400,000,000.0