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Long Term Debt and Financing Arrangements - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Dec. 31, 2019
Jul. 31, 2020
Apr. 30, 2020
Mar. 31, 2020
Jun. 30, 2020
Jun. 30, 2020
Jun. 30, 2019
Jul. 30, 2020
Debt Instrument [Line Items]                
Line of credit facility, borrowings           $ 225,000,000.0 $ 0  
Short-term debt outstanding $ 65,400,000       $ 145,200,000 $ 145,200,000    
2018 Credit Facility | Line of Credit | Credit Agreement                
Debt Instrument [Line Items]                
Debt term           5 years    
Line of credit, maximum borrowing capacity         750,000,000 $ 750,000,000    
Line of credit facility, accordion feature, higher borrowing capacity option         1,250,000,000 $ 1,250,000,000    
Line of credit facility covenants maximum debt to capitalization percentage           65.00%    
Line of credit facility, borrowings $ 0   $ 125,000,000.0 $ 100,000,000.0        
Line of credit facility, repayments         $ 100,000,000.0      
Interest rate         2.375% 2.375%    
2018 Credit Facility | Line of Credit | Credit Agreement | Subsequent Event                
Debt Instrument [Line Items]                
Line of credit facility, repayments   $ 125,000,000.0            
Line of credit facility, borrowing capacity               $ 750,000,000.0