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Financing Arrangements and Debt (Narrative) (Details) - 2018 Revolving Credit Facility [Member]
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Line of Credit Facility [Line Items]  
Credit facility maximum borrowing capacity $ 1,600.0
Credit facility, expiration date Nov. 01, 2023
Amount outstanding $ 325.0
Interest rate 4.105%
Letter of Credit [Member]  
Line of Credit Facility [Line Items]  
Amount outstanding $ 25.0