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Debt (Narrative) (Details)
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]  
Maximum borrowing capacity $ 1,250,000,000.00
Amount available for borrowing under credit facility 1,243,000,000
Standby Letters of Credit [Member]  
Debt Instrument [Line Items]  
Letters of Credit Outstanding, Amount 7,000,000
Bilateral Letters Of Credit [Member]  
Debt Instrument [Line Items]  
Letters of Credit Outstanding, Amount $ 90,000,000