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Acquisition Of Atwood Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Oct. 06, 2017
Oct. 05, 2017
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
May 26, 2017
Business Acquisition [Line Items]                            
Revenues     $ 454.2 $ 460.2 $ 457.5 $ 471.1 $ 504.6 $ 548.2 $ 909.6 $ 814.0 $ 1,843.0 $ 2,776.4 $ 4,063.4  
Net Income (Loss) Attributable to Parent     (207.1) $ (25.4) $ (45.5) $ (25.7) $ 39.0 $ 85.3 $ 590.6 $ 175.3 (303.7) 890.2 (1,594.8)  
Shares Issued, Price Per Share         $ 9.25                  
Bargain purchase gain     140.2               140.2 $ 0.0 $ 0.0  
Merger related costs     11.5                      
Intangible liabilities                     60.0      
Atwood Oceanics, Inc.                            
Business Acquisition [Line Items]                            
Revenues                     23.3      
Net Income (Loss) Attributable to Parent                     70.1      
Business Acquisition, Transaction Costs     27.9               27.9      
Common stock, value (in usd per share)   $ 9.33                        
Cash settlement for business acquisitions   $ 11.1                        
Consideration transferred $ 770.7 781.8                        
Cash and cash equivalents 445.4                          
Payments to extinguish acquiree liabilities   $ 1,300.0                        
Merger related costs                     19.4      
Property and equipment $ 1,762.0                          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent     2.5               2.5      
Intangible assets acquired                     33.3      
Asset amortization                     16.1      
Intangible assets, net     17.2               17.2      
Amortization expense, in 2018     11.4               11.4      
Amortization expense, in 2019     $ 5.8               $ 5.8      
Atwood Oceanics, Inc. | Class A Ordinary Shares, U.S. [Member]                            
Business Acquisition [Line Items]                            
Entity shares issued per acquiree share   1.60                        
Shares Issued, Price Per Share   $ 5.83                        
Share Price                           $ 6.70
Number of ordinary shares   132,200,000                        
Minimum [Member] | Drilling rigs and equipment [Member]                            
Business Acquisition [Line Items]                            
Property, Plant and Equipment, Useful Life                     4 years      
Minimum [Member] | Drilling rigs and equipment [Member] | Atwood Oceanics, Inc.                            
Business Acquisition [Line Items]                            
Property, Plant and Equipment, Useful Life                     16 years      
Maximum [Member] | Drilling rigs and equipment [Member]                            
Business Acquisition [Line Items]                            
Property, Plant and Equipment, Useful Life                     35 years      
Maximum [Member] | Drilling rigs and equipment [Member] | Atwood Oceanics, Inc.                            
Business Acquisition [Line Items]                            
Property, Plant and Equipment, Useful Life                     35 years