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Segment Information (Schedule Of Segment Reporting Information) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Segment Reporting Information [Line Items]          
Revenues $ 430,900,000 $ 460,200,000 $ 1,306,400,000 $ 1,388,800,000  
Operating Expenses [Abstract]          
Contract drilling (exclusive of depreciation) 327,100,000 285,800,000 996,600,000 855,200,000  
Depreciation expense 120,600,000 108,200,000 356,500,000 325,300,000  
General and administrative 25,100,000 30,400,000 79,100,000 86,900,000  
OPERATING INCOME (LOSS) (41,900,000) 35,800,000 (125,800,000) 121,400,000  
Property and equipment, net 12,731,600,000 11,096,400,000 12,731,600,000 11,096,400,000 $ 12,873,700,000
Floaters          
Segment Reporting Information [Line Items]          
Revenues 241,800,000 291,900,000 785,700,000 840,700,000  
Operating Expenses [Abstract]          
Contract drilling (exclusive of depreciation) 175,600,000 139,100,000 564,400,000 431,100,000  
Depreciation expense 77,800,000 72,700,000 233,900,000 217,500,000  
General and administrative 0 0 0 0  
OPERATING INCOME (LOSS) (11,600,000) 80,100,000 (12,600,000) 192,100,000  
Property and equipment, net 9,501,700,000 8,545,500,000 9,501,700,000 8,545,500,000  
Jackups          
Segment Reporting Information [Line Items]          
Revenues 173,300,000 153,100,000 475,400,000 503,800,000  
Operating Expenses [Abstract]          
Contract drilling (exclusive of depreciation) 136,400,000 132,900,000 390,100,000 383,800,000  
Depreciation expense 39,300,000 31,600,000 112,300,000 95,300,000  
General and administrative 0 0 0 0  
OPERATING INCOME (LOSS) (2,400,000) (11,400,000) (27,000,000) 24,700,000  
Property and equipment, net 3,190,200,000 2,502,400,000 3,190,200,000 2,502,400,000  
Other          
Segment Reporting Information [Line Items]          
Revenues 15,800,000 15,200,000 45,300,000 44,300,000  
Operating Expenses [Abstract]          
Contract drilling (exclusive of depreciation) 15,100,000 13,800,000 42,100,000 40,300,000  
Depreciation expense 0 0 0 0  
General and administrative 0 0 0 0  
OPERATING INCOME (LOSS) 700,000 1,400,000 3,200,000 4,000,000  
Property and equipment, net 0 0 0 0  
Operating Segments Total          
Segment Reporting Information [Line Items]          
Revenues 430,900,000 460,200,000 1,306,400,000 1,388,800,000  
Operating Expenses [Abstract]          
Contract drilling (exclusive of depreciation) 327,100,000 285,800,000 996,600,000 855,200,000  
Depreciation expense 117,100,000 104,300,000 346,200,000 312,800,000  
General and administrative 0 0 0 0  
OPERATING INCOME (LOSS) (13,300,000) 70,100,000 (36,400,000) 220,800,000  
Property and equipment, net 12,691,900,000 11,047,900,000 12,691,900,000 11,047,900,000  
Reconciling Items          
Segment Reporting Information [Line Items]          
Revenues 0 0 0 0  
Operating Expenses [Abstract]          
Contract drilling (exclusive of depreciation) 0 0 0 0  
Depreciation expense 3,500,000 3,900,000 10,300,000 12,500,000  
General and administrative 25,100,000 30,400,000 79,100,000 86,900,000  
OPERATING INCOME (LOSS) (28,600,000) (34,300,000) (89,400,000) (99,400,000)  
Property and equipment, net $ 39,700,000 $ 48,500,000 $ 39,700,000 $ 48,500,000