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Long Term Debt and Financing Arrangements - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended
Apr. 30, 2020
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Debt Instrument [Line Items]        
Line of credit facility, borrowings   $ 100,000,000.0 $ 0  
Short-term debt outstanding   $ 106,700,000   $ 65,400,000
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    
Line of credit facility, accordion feature, higher borrowing capacity option   $ 1,250,000,000    
Line of credit facility covenants maximum debt to capitalization percentage   65.00%    
Line of credit facility, borrowings   $ 100,000,000    
Line of credit, borrowings outstanding       $ 0
Subsequent Event | 2018 Credit Facility | Line of Credit | Credit Agreement        
Debt Instrument [Line Items]        
Line of credit facility, borrowings $ 125,000,000      
Weighted average interest rate 2.15%