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Senior Notes (Narrative) (Details) - Senior Notes [Member] - 4.868% Senior notes due 6/1/2044 [Member]
9 Months Ended
Sep. 30, 2019
USD ($)
Debt Instrument [Line Items]  
Date issued Jun. 05, 2014
Debt instrument face amount $ 400,000,000
Debt instrument, term 30 years
Debt instrument, stated interest rate 4.868%
Debt instrument, maturity date Jun. 01, 2044