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Debt:2024 Notes (Details) - 5.625% Senior Notes Due 2024 [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Aug. 29, 2016
Debt Instrument [Line Items]    
Debt Instrument, Face Amount   $ 350
Interest rate   5.625%
Dividend Restriction, Interest Leverage Ratio (as a Percent) 350.00%