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Derivative Instruments (Schedule Of Estimated Amount Of Net Gains Associated With Derivatives) (Details)
$ in Millions
Dec. 31, 2016
USD ($)
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Net unrealized gains to be reclassified to contract drilling expense $ (5.0)
Net realized gains to be reclassified to depreciation expense 0.9
Net realized (losses) to be reclassified to interest expense (0.4)
Net gains to be reclassified to earnings $ (4.5)