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Debt (Senior Credit Facilities Narrative) (Details)
$ in Millions
Jun. 30, 2021
USD ($)
Revolving Credit Facility [Member] | Senior Unsecured Revolving Credit Facility [Member]  
Debt Instrument [Line Items]  
Maximum borrowing base $ 1,250 [1]
[1] The margin for borrowings under the senior unsecured revolving credit facility was 1.5% above LIBOR or EURIBOR at current Company credit ratings.