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Segment Information (Schedule Of Segment Reporting Information) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Segment Reporting Information [Line Items]          
Revenues $ 1,059,000,000 $ 1,136,600,000 $ 2,222,900,000 $ 2,203,300,000  
Operating Expenses [Abstract]          
Contract drilling (exclusive of depreciation) 502,600,000 542,500,000 1,020,900,000 1,062,700,000  
Asset Impairment Charges 0 703,500,000 0 703,500,000  
Depreciation 140,500,000 132,200,000 277,600,000 263,300,000  
General and administrative 29,700,000 36,200,000 59,800,000 74,300,000  
OPERATING (LOSS) INCOME 386,200,000 (277,800,000) 864,600,000 99,500,000  
Property and equipment, net 13,169,900,000 12,881,200,000 13,169,900,000 12,881,200,000 $ 12,534,800,000
Floaters [Member]          
Segment Reporting Information [Line Items]          
Revenues 634,300,000 679,500,000 1,329,300,000 1,331,100,000  
Operating Expenses [Abstract]          
Contract drilling (exclusive of depreciation) 277,700,000 309,900,000 571,200,000 616,500,000  
Asset Impairment Charges   703,500,000   703,500,000  
Depreciation 94,400,000 88,300,000 187,400,000 179,000,000  
General and administrative 0 0 0 0  
OPERATING (LOSS) INCOME 262,200,000 (422,200,000) 570,700,000 (167,900,000)  
Property and equipment, net 9,870,700,000 9,661,100,000 9,870,700,000 9,661,100,000  
Jackup [Member]          
Segment Reporting Information [Line Items]          
Revenues 384,100,000 440,600,000 812,400,000 839,100,000  
Operating Expenses [Abstract]          
Contract drilling (exclusive of depreciation) 192,700,000 220,900,000 384,200,000 423,200,000  
Asset Impairment Charges   0   0  
Depreciation 43,600,000 41,800,000 85,100,000 80,300,000  
General and administrative 0 0 0 0  
OPERATING (LOSS) INCOME 147,800,000 177,900,000 343,100,000 335,600,000  
Property and equipment, net 3,223,400,000 3,152,900,000 3,223,400,000 3,152,900,000  
Other [Member]          
Segment Reporting Information [Line Items]          
Revenues 40,600,000 16,500,000 81,200,000 33,100,000  
Operating Expenses [Abstract]          
Contract drilling (exclusive of depreciation) 32,200,000 11,700,000 65,500,000 23,000,000  
Asset Impairment Charges   0   0  
Depreciation 0 0 0 0  
General and administrative 0 0 0 0  
OPERATING (LOSS) INCOME 8,400,000 4,800,000 15,700,000 10,100,000  
Property and equipment, net 0 0 0 0  
Operating Segments Total [Member]          
Segment Reporting Information [Line Items]          
Revenues 1,059,000,000 1,136,600,000 2,222,900,000 2,203,300,000  
Operating Expenses [Abstract]          
Contract drilling (exclusive of depreciation) 502,600,000 542,500,000 1,020,900,000 1,062,700,000  
Asset Impairment Charges   703,500,000   703,500,000  
Depreciation 138,000,000 130,100,000 272,500,000 259,300,000  
General and administrative 0 0 0 0  
OPERATING (LOSS) INCOME 418,400,000 (239,500,000) 929,500,000 177,800,000  
Property and equipment, net 13,094,100,000 12,814,000,000 13,094,100,000 12,814,000,000  
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  
Asset Impairment Charges   0   0  
Depreciation 2,500,000 2,100,000 5,100,000 4,000,000  
General and administrative 29,700,000 36,200,000 59,800,000 74,300,000  
OPERATING (LOSS) INCOME (32,200,000) (38,300,000) (64,900,000) (78,300,000)  
Property and equipment, net $ 75,800,000 $ 67,200,000 $ 75,800,000 $ 67,200,000