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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2019
Fair Value Disclosures [Abstract] |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Table Text Block] | Assets measured at fair value on a recurring basis are presented below (in millions):
|  |  | Estimated fair value measurements
| Fair value |  | Quoted prices in active markets (Level 1) |  | Significant other observable inputs (Level 2) |  | Significant other unobservable inputs (Level 3)
March 31, 2019: |  |  |  |  |  |  |
Assets - cash equivalents | $ | 896.7 |  |  | $ | 896.7 |  |  | $ | — |  |  | $ | — |
Other assets (Egyptian Pounds) | 1.0 |  |  | 1.0 |  |  | — |  |  | — |
Other assets (Angolan Kwanza) | 1.9 |  |  | 1.9 |  |  | — |  |  | — |
December 31, 2018: |  |  |  |  |  |  |
Assets - cash equivalents | $ | 990.5 |  |  | $ | 990.5 |  |  | $ | — |  |  | $ | — |
Other assets (Egyptian Pounds) | 0.7 |  |  | 0.7 |  |  | — |  |  | — |
Other assets (Angolan Kwanza) | 1.7 |  |  | 1.7 |  |  | — |  |  | — |
Fair Value, Concentration of Risk [Table Text Block] | Revenue and receivables from transactions with external customers that amount to 10% or more of revenue during the three months ended March 31 are set forth below: Percentage of revenue from major customers:
|  |  |  | Three months ended March 31,
Customer |  | Segment |  | 2019 |  | 2018
ARO Drilling (1) |  | Jack-ups and Unallocated and other |  | 27 | % |  | 11 | %
BP Trinidad and Tobago |  | Jack-ups |  | 12 | % |  | 5 | %
Saudi Aramco |  | Jack-ups |  | — | % |  | 35 | %
Anadarko |  | Deepwater |  | — | % |  | 24 | %
Lundin |  | Jack-ups |  | — | % |  | 10 | %
(1) Includes revenue related to services provided to ARO (see Note 4).
Percentage of receivables from major customers:
Customer |  | Segment |  | March 31, 2019 |  | December 31, 2018
ARO Drilling (1) |  | Jack-ups and Unallocated and other |  | 27 | % |  | 30 | %
BP Trinidad and Tobago |  | Jack-ups |  | 8 | % |  | 9 | %
Saudi Aramco |  | Jack-ups |  | 21 | % |  | 21 | %
Anadarko |  | Deepwater |  | — | % |  | — | %
Lundin |  | Jack-ups |  | — | % |  | — | %
(1) Includes receivables related to services provided to ARO (see Note 4).

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- Definition Tabular disclosure of all significant concentrations of risk, including credit risk and market risk, arising from all financial instruments (as defined), whether from an individual counterparty or groups of counterparties. The disclosure concerning concentrations of risk may consist of the following information: (1) for concentrations of credit risk disclosure may include: (a) information about the (shared) activity, region, or economic characteristic that identifies the concentration, (b) the maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity, (c) the policy of requiring collateral or other security to support financial instruments subject to credit risk, information about the entity's access to that collateral or other security, and the nature and a brief description of the collateral or other security supporting those financial instruments, and (d) the policy of entering into master netting arrangements to mitigate the credit risk of financial instruments, information about the arrangements for which the entity is a party, and a brief description of the terms of those arrangements, including the extent to which they would reduce the entity's maximum amount of loss due to credit risk and (2) for disclosure of quantitative information about the market risks of financial instruments that is consistent with the way the company manages or adjusts those risks, disclosure may include: (a) more details about current positions and perhaps activity during the period, (b) the hypothetical effects on comprehensive income (or net assets), or annual income, of several possible changes in market prices, (c) a gap analysis of interest rate re-pricing or maturity dates, (d) the duration of the financial instruments, (e) the entity's value at risk from derivatives and from other positions at the end of the reporting period and the average value at risk during the year, or (f) other ways of reporting quantitative information as internally developed. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13572-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13531-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13587-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13537-108611 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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