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Segment Information (Schedule Of Segment Reporting Information) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Segment Reporting Information [Line Items]          
Revenues $ 909,600,000 $ 1,059,000,000 $ 1,723,600,000 $ 2,222,900,000  
Operating Expenses [Abstract]          
Contract drilling (exclusive of depreciation) 350,200,000 502,600,000 713,900,000 1,020,900,000  
Depreciation 112,400,000 140,500,000 225,700,000 277,600,000  
General and administrative 27,400,000 29,700,000 50,800,000 59,800,000  
OPERATING (LOSS) INCOME 419,600,000 386,200,000 733,200,000 864,600,000  
Property and equipment, net 11,021,200,000 13,169,900,000 11,021,200,000 13,169,900,000 $ 11,087,800,000
Floaters [Member]          
Segment Reporting Information [Line Items]          
Revenues 636,400,000 634,300,000 1,149,000,000 1,329,300,000  
Operating Expenses [Abstract]          
Contract drilling (exclusive of depreciation) 208,600,000 277,700,000 419,900,000 571,200,000  
Depreciation 77,800,000 94,400,000 158,100,000 187,400,000  
General and administrative 0 0 0 0  
OPERATING (LOSS) INCOME 350,000,000 262,200,000 571,000,000 570,700,000  
Property and equipment, net 8,414,100,000 9,870,700,000 8,414,100,000 9,870,700,000  
Jackup [Member]          
Segment Reporting Information [Line Items]          
Revenues 251,300,000 384,100,000 529,200,000 812,400,000  
Operating Expenses [Abstract]          
Contract drilling (exclusive of depreciation) 122,300,000 192,700,000 256,800,000 384,200,000  
Depreciation 30,100,000 43,600,000 58,700,000 85,100,000  
General and administrative 0 0 0 0  
OPERATING (LOSS) INCOME 98,900,000 147,800,000 213,700,000 343,100,000  
Property and equipment, net 2,543,000,000 3,223,400,000 2,543,000,000 3,223,400,000  
Other [Member]          
Segment Reporting Information [Line Items]          
Revenues 21,900,000 40,600,000 45,400,000 81,200,000  
Operating Expenses [Abstract]          
Contract drilling (exclusive of depreciation) 19,300,000 32,200,000 37,200,000 65,500,000  
Depreciation 0 0 0 0  
General and administrative 0 0 0 0  
OPERATING (LOSS) INCOME 2,600,000 8,400,000 8,200,000 15,700,000  
Property and equipment, net 0 0 0 0  
Operating Segments Total [Member]          
Segment Reporting Information [Line Items]          
Revenues 909,600,000 1,059,000,000 1,723,600,000 2,222,900,000  
Operating Expenses [Abstract]          
Contract drilling (exclusive of depreciation) 350,200,000 502,600,000 713,900,000 1,020,900,000  
Depreciation 107,900,000 138,000,000 216,800,000 272,500,000  
General and administrative 0 0 0 0  
OPERATING (LOSS) INCOME 451,500,000 418,400,000 792,900,000 929,500,000  
Property and equipment, net 10,957,100,000 13,094,100,000 10,957,100,000 13,094,100,000  
Reconciling Items [Member]          
Segment Reporting Information [Line Items]          
Revenues 0 0 0 0  
Operating Expenses [Abstract]          
Contract drilling (exclusive of depreciation) 0 0 0 0  
Depreciation 4,500,000 2,500,000 8,900,000 5,100,000  
General and administrative 27,400,000 29,700,000 50,800,000 59,800,000  
OPERATING (LOSS) INCOME (31,900,000) (32,200,000) (59,700,000) (64,900,000)  
Property and equipment, net $ 64,100,000 $ 75,800,000 $ 64,100,000 $ 75,800,000