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Debt Debt:2024 Notes (Details) - 5.625% Senior Notes Due 2024 [Member] - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2018
Aug. 29, 2016
Debt Instrument [Line Items]    
Debt Instrument, Face Amount   $ 350
Interest rate   5.625%
Dividend restriction, interest coverage ratio (as a percent) 350.00%