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Financing Arrangements and Debt (Narrative) (Details) - 2018 Revolving Credit Facility
3 Months Ended
Mar. 31, 2020
USD ($)
Line of Credit Facility [Line Items]  
Credit facility maximum borrowing capacity $ 1,600,000,000
Amount outstanding $ 170,000,000.0
Interest rate 2.44%
Letter of Credit  
Line of Credit Facility [Line Items]  
Amount outstanding $ 3,900,000