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Acquisition Of Atwood Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 06, 2017 | Oct. 05, 2017 | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2018 | May 26, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share |  |  |  |  |  |  |  |  | $ 9.25 |
Bargain purchase gain |  |  |  | $ 142.0 | $ 1.8 |  | $ 140.2 | $ 0.0 |  |
Merger related costs |  |  | $ 11.5 |  |  |  |  |  |  |
Number of contract drilling rigs |  |  |  |  | 56 |  |  |  |  |
Intangible liabilities |  |  |  |  | $ 60.0 |  |  |  |  |
Atwood Oceanics, Inc. |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, value (in usd per share) |  | $ 9.33 |  |  |  |  |  |  |  |
Cash settlement for business acquisitions |  | $ 11.1 |  |  |  |  |  |  |  |
Consideration transferred | $ 770.7 | 781.8 |  | 781.8 |  |  |  |  |  |
Cash and cash equivalents | 445.4 |  |  | 445.4 |  | $ 445.4 |  |  |  |
Payments to extinguish acquiree liabilities |  | $ 1,300.0 |  |  |  |  |  |  |  |
Bargain purchase gain | 140.2 |  |  |  |  | 1.8 |  |  |  |
Merger related costs |  |  |  |  |  |  | 19.4 |  |  |
Number of contract drilling rigs |  |  |  |  | 4 |  |  |  |  |
Property and equipment | 1,762.0 |  |  | $ 1,771.2 |  | $ 1,771.2 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent | 2.5 |  |  |  |  |  |  |  |  |
Intangible assets acquired | $ 30.1 |  |  |  |  |  |  |  |  |
Asset amortization |  |  |  |  | $ 11.4 |  | $ 16.1 |  |  |
Intangible assets, net |  |  | $ 2.6 |  | $ 2.6 |  |  |  |  |
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 |  |  |  |  |  |  |  |
Number of ordinary shares |  | 132,200,000 |  |  |  |  |  |  |  |
Share Price |  |  |  |  |  |  |  |  |  | $ 6.70
Construction in Progress [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of contract drilling rigs |  |  |  |  | 3 |  |  |  |  |
Construction in Progress [Member] | Atwood Oceanics, Inc. |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of contract drilling rigs |  |  |  |  | 2 |  |  |  |  |
Moored Semisubmersible Rigs [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of contract drilling rigs |  |  |  |  | 3 |  |  |  |  |
Moored Semisubmersible Rigs [Member] | Atwood Oceanics, Inc. |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of contract drilling rigs |  |  |  |  | 2 |  |  |  |  |
Jackup Rigs [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of contract drilling rigs |  |  |  |  | 35 |  |  |  |  |
Jackup Rigs [Member] | Atwood Oceanics, Inc. |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of contract drilling rigs |  |  |  |  | 5 |  |  |  |  |
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 | 30 years |  |  |  | 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 |  |  |  | 35 years |  |  |  |  |

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