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Segment Information (Schedule Of Segment Reporting Information) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Segment Reporting Information [Line Items]          
Revenues $ 548,200,000 $ 1,012,200,000 $ 2,271,800,000 $ 3,235,100,000  
Operating Expenses [Abstract]          
Contract drilling (exclusive of depreciation) 298,100,000 433,500,000 1,012,000,000 1,454,400,000  
Loss on impairment 0 2,400,000 0 2,400,000  
Depreciation 109,400,000 145,200,000 335,100,000 422,800,000  
General and administrative 25,300,000 28,400,000 76,100,000 88,200,000  
OPERATING INCOME 115,400,000 402,700,000 848,600,000 1,267,300,000  
Property and equipment, net 10,959,700,000 13,528,900,000 10,959,700,000 13,528,900,000 $ 11,087,800,000
Operating Segments [Member] | Floaters [Member]          
Segment Reporting Information [Line Items]          
Revenues 319,300,000 646,400,000 1,468,300,000 1,975,700,000  
Operating Expenses [Abstract]          
Contract drilling (exclusive of depreciation) 153,700,000 242,400,000 573,600,000 813,600,000  
Loss on impairment   0   0  
Depreciation 72,900,000 95,700,000 231,000,000 283,100,000  
General and administrative 0 0 0 0  
OPERATING INCOME 92,700,000 308,300,000 663,700,000 879,000,000  
Property and equipment, net 8,360,400,000 10,260,500,000 8,360,400,000 10,260,500,000  
Operating Segments [Member] | Jackup [Member]          
Segment Reporting Information [Line Items]          
Revenues 213,800,000 325,800,000 743,000,000 1,138,200,000  
Operating Expenses [Abstract]          
Contract drilling (exclusive of depreciation) 133,200,000 160,000,000 390,000,000 544,200,000  
Loss on impairment   2,400,000   2,400,000  
Depreciation 32,100,000 44,800,000 90,800,000 129,900,000  
General and administrative 0 0 0  
OPERATING INCOME 48,500,000 118,600,000 262,200,000 461,700,000  
Property and equipment, net 2,537,900,000 3,194,600,000 2,537,900,000 3,194,600,000  
Operating Segments [Member] | Other [Member]          
Segment Reporting Information [Line Items]          
Revenues 15,100,000 40,000,000 60,500,000 121,200,000  
Operating Expenses [Abstract]          
Contract drilling (exclusive of depreciation) 11,200,000 31,100,000 48,400,000 96,600,000  
Loss on impairment   0   0  
Depreciation 0 0 0 0  
General and administrative 0 0 0 0  
OPERATING INCOME 3,900,000 8,900,000 12,100,000 24,600,000  
Property and equipment, net 0 0 0 0  
Operating Segments [Member] | Operating Segments Total [Member]          
Segment Reporting Information [Line Items]          
Revenues 548,200,000 1,012,200,000 2,271,800,000 3,235,100,000  
Operating Expenses [Abstract]          
Contract drilling (exclusive of depreciation) 298,100,000 433,500,000 1,012,000,000 1,454,400,000  
Loss on impairment   2,400,000   2,400,000  
Depreciation 105,000,000 140,500,000 321,800,000 413,000,000  
General and administrative 0 0 0 0  
OPERATING INCOME 145,100,000 435,800,000 938,000,000 1,365,300,000  
Property and equipment, net 10,898,300,000 13,455,100,000 10,898,300,000 13,455,100,000  
Corporate, Non-Segment [Member] | 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  
Loss on impairment   0   0  
Depreciation 4,400,000 4,700,000 13,300,000 9,800,000  
General and administrative 25,300,000 28,400,000 76,100,000 88,200,000  
OPERATING INCOME (29,700,000) (33,100,000) (89,400,000) (98,000,000)  
Property and equipment, net $ 61,400,000 $ 73,800,000 $ 61,400,000 $ 73,800,000