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Acquisition of Atwood Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Oct. 06, 2017 | Jun. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2017
Liabilities: |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Net Assets |  | $ 8.3 | $ 8.3 |
Payments For Business Acquisition, Acquired Entity Liabilities | $ (1,305.9) |  |  |
Bargain purchase gain | 148.5 |  | 8.3 | $ 0.0
Atwood |  |  |  |
Assets: |  |  |  |
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 | 60.7 |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accounts Receivable |  |  | (1.6) |
Other current assets | 122.8 |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Current Assets |  |  | 4.7 |
Property and equipment | 1,771.2 |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment |  |  | 9.2 |
Other assets | 20.8 |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Assets |  |  | (2.9) |
Liabilities: |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable | 62.6 |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accounts Payable And Accrued Liabilities |  |  | (2.3) |
Other liabilities | 122.1 |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Liabilities |  |  | $ 3.4 |
Net assets acquired | 2,236.2 |  |  |
Repayment of Atwood debt | (781.8) |  |  |
Scenario, Previously Reported [Member] |  |  |  |
Liabilities: |  |  |  |
Payments For Business Acquisition, Acquired Entity Liabilities | (1,305.9) |  |  |
Bargain purchase gain | 140.2 |  |  |
Scenario, Previously Reported [Member] | Atwood |  |  |  |
Assets: |  |  |  |
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 |  |  |
Other current assets | 118.1 |  |  |
Property and equipment | 1,762.0 |  |  |
Other assets | 23.7 |  |  |
Liabilities: |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable | 64.9 |  |  |
Other liabilities | 118.7 |  |  |
Net assets acquired | 2,227.9 |  |  |
Repayment of Atwood debt | $ (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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