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Segment Information (Schedule Of Segment Reporting Information) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Segment Reporting Information [Line Items]          
Revenues $ 583,900,000 $ 458,500,000 $ 989,800,000 $ 875,500,000  
Operating Expenses [Abstract]          
Contract drilling (exclusive of depreciation) 500,300,000 344,300,000 832,900,000 669,500,000  
Asset Impairment Charges 2,500,000 0 2,500,000 0  
Depreciation expense 157,900,000 120,700,000 282,900,000 235,900,000  
General and administrative 81,200,000 26,100,000 110,800,000 54,000,000.0  
Income (Loss) from Equity Method Investments (600,000) 0 (600,000) 0  
OPERATING LOSS (157,400,000) (32,600,000) (238,700,000) (83,900,000)  
Property and equipment, net 15,455,700,000 12,783,900,000 15,455,700,000 12,783,900,000 $ 12,616,200,000
Floaters          
Segment Reporting Information [Line Items]          
Revenues 295,600,000 284,900,000 528,300,000 543,900,000  
Operating Expenses [Abstract]          
Contract drilling (exclusive of depreciation) 249,200,000 203,700,000 431,000,000.0 388,800,000  
Depreciation expense 98,400,000 80,800,000 183,200,000 156,100,000  
General and administrative 0 0 0 0  
OPERATING LOSS (52,000,000.0) 400,000 (85,900,000) (1,000,000.0)  
Property and equipment, net 10,364,700,000 9,574,900,000 10,364,700,000 9,574,900,000  
Jackups          
Segment Reporting Information [Line Items]          
Revenues 229,200,000 158,700,000 386,200,000 302,100,000  
Operating Expenses [Abstract]          
Contract drilling (exclusive of depreciation) 212,200,000 126,800,000 347,600,000 253,700,000  
Depreciation expense 55,500,000 36,500,000 92,400,000 73,000,000.0  
General and administrative 0 0 0 0  
OPERATING LOSS (38,500,000) (4,600,000) (53,800,000) (24,600,000)  
Property and equipment, net 5,055,600,000 3,167,000,000.0 5,055,600,000 3,167,000,000.0  
ARO          
Segment Reporting Information [Line Items]          
Revenues 123,800,000   123,800,000    
Operating Expenses [Abstract]          
Contract drilling (exclusive of depreciation) 78,900,000   78,900,000    
Depreciation expense 12,400,000   12,400,000    
General and administrative 5,300,000   5,300,000    
OPERATING LOSS 27,200,000   27,200,000    
Property and equipment, net 656,500,000   656,500,000    
Other          
Segment Reporting Information [Line Items]          
Revenues 59,100,000 14,900,000 75,300,000 29,500,000  
Operating Expenses [Abstract]          
Contract drilling (exclusive of depreciation) 38,900,000 13,800,000 54,300,000 27,000,000.0  
Depreciation expense 0 0 0 0  
General and administrative 0 0 0 0  
OPERATING LOSS 20,200,000 1,100,000 21,000,000.0 2,500,000  
Property and equipment, net 0 0 0 0  
Reconciling Items          
Segment Reporting Information [Line Items]          
Revenues (123,800,000) 0 (123,800,000) 0  
Operating Expenses [Abstract]          
Contract drilling (exclusive of depreciation) (78,900,000) 0 (78,900,000) 0  
Asset Impairment Charges 2,500,000        
Depreciation expense (8,400,000) 3,400,000 (5,100,000) 6,800,000  
General and administrative 75,900,000 26,100,000 105,500,000 54,000,000.0  
Income (Loss) from Equity Method Investments (600,000)   (600,000)    
OPERATING LOSS (114,300,000) (29,500,000) (147,200,000) (60,800,000)  
Property and equipment, net $ (621,100,000) $ 42,000,000.0 $ (621,100,000) $ 42,000,000.0