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Acquisition Of Atwood Assets Acquired Liabilities Assumed (Details) - USD ($) $ in Millions |  | 3 Months Ended
--- | --- | ---
Oct. 06, 2017 | Mar. 31, 2018 | Mar. 31, 2017
Liabilities [Abstract] |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Net Assets |  | $ 16.6 |
Payments For Business Acquisition, Acquired Entity Liabilities | $ (1,305.9) |  |
Gain on bargain purchase | (156.8) | (16.6) | $ 0.0
Atwood Oceanics, Inc. [Member] |  |  |
Assets [Abstract] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents | 445.4 |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Cash And Cash Equivalents |  | 0.0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables | 62.3 |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accounts Receivable |  | 0.0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other | 125.0 |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Current Assets |  | 6.9 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment | 1,768.9 |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment |  | 6.9 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets | 23.9 |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Assets |  | 0.2 |
Liabilities [Abstract] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable | 62.3 |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accounts Payable And Accrued Liabilities |  | (2.6) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other | 118.7 |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Liabilities |  | $ 0.0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net | 2,244.5 |  |
Business Combination, Consideration Transferred | (781.8) |  |
Scenario, Previously Reported [Member] |  |  |
Liabilities [Abstract] |  |  |
Payments For Business Acquisition, Acquired Entity Liabilities | (1,305.9) |  |
Gain on bargain purchase | (140.2) |  |
Scenario, Previously Reported [Member] | Atwood Oceanics, Inc. [Member] |  |  |
Assets [Abstract] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents | 445.4 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables | 62.3 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other | 118.1 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment | 1,762.0 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets | 23.7 |  |
Liabilities [Abstract] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable | 64.9 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other | 118.7 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net | 2,227.9 |  |
Business Combination, Consideration Transferred | $ (781.8) |  |

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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