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Supplemental Financial Information | 12 Months Ended
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Dec. 31, 2018
Supplemental Financial Information [Abstract] |
Supplemental Balance Sheet Disclosures [Text Block] | . SUPPLEMENTAL FINANCIAL INFORMATION Consolidated Balance Sheet Information Accounts receivable, net, as of December 31, 2018 and 2017 consisted of the following (in millions):
|  | 2018 |  | 2017
Trade(1) |  | $ | 301.7 |  |  | $ | 335.4 |
Other |  | 46.4 |  |  | 33.6 |
|  | 348.1 |  |  | 369.0 |
Allowance for doubtful accounts (1) |  | (3.4 | ) |  | (23.6 | )
|  | $ | 344.7 |  |  | $ | 345.4 |
(1) The decline in trade receivables and allowance for doubtful accounts is primarily due to the settlement with Petrobras described in "Note 12 - Commitments and Contingencies". Other current assets as of December 31, 2018 and 2017 consisted of the following (in millions):
|  | 2018 |  | 2017
Inventory |  | $ | 268.1 |  |  | $ | 278.8 |
Prepaid taxes |  | 35.0 |  |  | 43.5 |
Deferred costs |  | 23.5 |  |  | 29.7 |
Prepaid expenses |  | 15.2 |  |  | 14.2 |
Other |  | 19.1 |  |  | 15.0 |
|  | $ | 360.9 |  |  | $ | 381.2 |
Other assets as of December 31, 2018 and 2017 consisted of the following (in millions):
|  | 2018 |  | 2017
Deferred tax assets |  | $ | 29.4 |  |  | $ | 38.8 |
Supplemental executive retirement plan assets |  | 27.2 |  |  | 30.9 |
Deferred costs |  | 21.5 |  |  | 37.4 |
Intangible assets |  | 2.5 |  |  | 15.7 |
Other |  | 17.2 |  |  | 17.4 |
|  | $ | 97.8 |  |  | $ | 140.2 |
Accrued liabilities and other as of December 31, 2018 and 2017 consisted of the following (in millions):
|  | 2018 |  | 2017
Accrued interest |  | $ | 100.6 |  |  | $ | 83.1 |
Personnel costs |  | 82.5 |  |  | 112.0 |
Deferred revenue |  | 56.9 |  |  | 71.9 |
Income and other taxes payable |  | 36.9 |  |  | 46.4 |
Derivative liabilities |  | 10.9 |  |  | .4 |
Other |  | 30.2 |  |  | 12.1 |
|  | $ | 318.0 |  |  | $ | 325.9 |
Other liabilities as of December 31, 2018 and 2017 consisted of the following (in millions):
|  | 2018 |  | 2017
Unrecognized tax benefits (inclusive of interest and penalties) |  | $ | 177.0 |  |  | $ | 178.0 |
Deferred tax liabilities |  | 70.7 |  |  | 18.5 |
Intangible liabilities |  | 53.5 |  |  | 59.6 |
Supplemental executive retirement plan liabilities |  | 28.1 |  |  | 32.0 |
Personnel costs |  | 25.1 |  |  | 18.1 |
Deferred revenue |  | 20.5 |  |  | 51.2 |
Deferred rent |  | 11.7 |  |  | 17.1 |
Other |  | 9.4 |  |  | 12.2 |
|  | $ | 396.0 |  |  | $ | 386.7 |
Accumulated other comprehensive income as of December 31, 2018 and 2017 consisted of the following (in millions):
|  | 2018 |  | 2017
Derivative instruments |  | $ | 12.6 |  |  | $ | 22.5 |
Currency translation adjustment |  | 7.3 |  |  | 7.8 |
Other |  | (1.7 | ) |  | (1.7 | )
|  | $ | 18.2 |  |  | $ | 28.6 |
Consolidated Statement of Operations Information Repair and maintenance expense related to continuing operations for each of the years in the three-year period ended December 31, 2018 was as follows (in millions):
|  | 2018 |  | 2017 |  | 2016
Repair and maintenance expense |  | $ | 198.4 |  |  | $ | 188.7 |  |  | $ | 151.1 |
Consolidated Statement of Cash Flows Information Net cash provided by (used in) operating activities of continuing operations attributable to the net change in operating assets and liabilities for each of the years in the three-year period ended December 31, 2018 was as follows (in millions):
|  | 2018 |  | 2017 |  | 2016
(Increase) decrease in accounts receivable |  | $ | (6.2 | ) |  | $ | 83.2 |  |  | $ | 222.4 |
(Increase) decrease in other assets |  | (2.8 | ) |  | (14.0 | ) |  | 44.0 |
Decrease in liabilities |  | (9.0 | ) |  | (3.8 | ) |  | (125.8 | )
|  | $ | (18.0 | ) |  | $ | 65.4 |  |  | $ | 140.6 |
During periods in which our business contracts, resulting in significantly lower revenues and expenses as compared to the prior year, we typically generate positive cash flows from the net change in operating assets and liabilities as the impact from the collection of receivables that were accrued during the prior period is generally larger than the impact from the payment of expenses incurred in the prior period. For the years ended December 31, 2017 and 2016, our business contracted significantly as compared to the respective prior year periods resulting in positive cash generated from the net change in operating assets and liabilities. During the year ended December 31, 2018, our business contracted at a more moderate pace, resulting in modest negative cash flows from the net change in operating assets and liabilities. Cash paid for interest and income taxes for each of the years in the three-year period ended December 31, 2018 was as follows (in millions):
|  | 2018 |  | 2017 |  | 2016
Interest, net of amounts capitalized |  | $ | 232.6 |  |  | $ | 199.8 |  |  | $ | 264.8 |
Income taxes |  | 58.4 |  |  | 62.8 |  |  | 56.4 |
Capitalized interest totaled $62.6 million, $72.5 million and $45.7 million during the years ended December 31, 2018, 2017 and 2016, respectively. Capital expenditure accruals totaling $27.8 million, $234.3 million and $11.5 million for the years ended December 31, 2018, 2017 and 2016, respectively, were excluded from investing activities in our consolidated statements of cash flows. In January 2018, we made a $207.4 million milestone payment for ENSCO 123 and the remaining unpaid balance of $9.0 million is due upon delivery. The $207.4 million milestone payment was invoiced and included in accounts payable - trade as of December 31, 2017 on our consolidated balance sheet. Amortization, net, includes amortization of deferred mobilization revenues and costs, deferred capital upgrade revenues, intangible amortization and other amortization. Other includes amortization of debt discounts and premiums, deferred financing costs, deferred charges for income taxes incurred on intercompany transfers of drilling rigs and other items. Concentration of Risk We are exposed to credit risk relating to our receivables from customers, our cash and cash equivalents, investments and our use of derivatives in connection with the management of foreign currency exchange rate risk. We mitigate our credit risk relating to receivables from customers, which consist primarily of major international, government-owned and independent oil and gas companies, by performing ongoing credit evaluations. We also maintain reserves for potential credit losses, which generally have been within our expectations. We mitigate our credit risk relating to cash and investments by focusing on diversification and quality of instruments. Short-term investments consist of a portfolio of time deposits held with several well-capitalized financial institutions, and we monitor the financial condition of those financial institutions. We mitigate our credit risk relating to counterparties of our derivatives through a variety of techniques, including transacting with multiple, high-quality financial institutions, thereby limiting our exposure to individual counterparties and by entering into ISDA Master Agreements, which include provisions for a legally enforceable master netting agreement, with our derivative counterparties. See "Note 7 - Derivative Instruments" for additional information on our derivative activity. The terms of the ISDA agreements may also include credit support requirements, cross default provisions, termination events or set-off provisions. Legally enforceable master netting agreements reduce credit risk by providing protection in bankruptcy in certain circumstances and generally permitting the closeout and netting of transactions with the same counterparty upon the occurrence of certain events. Consolidated revenues by customer for the years ended December 31, 2018, 2017 and 2016 were as follows:
|  | 2018 |  | 2017 |  | 2016
Total(1) |  | 15 | % |  | 22 | % |  | 13 | %
Saudi Aramco(2) |  | 11 | % |  | 9 | % |  | 6 | %
Petrobras(1) |  | 8 | % |  | 11 | % |  | 9 | %
BP (3) |  | 7 | % |  | 15 | % |  | 12 | %
Other |  | 59 | % |  | 43 | % |  | 60 | %
|  | 100 | % |  | 100 | % |  | 100 | %
(1) | For the years ended December 31, 2018, 2017 and 2016, all Total and Petrobras revenues were attributable to the Floater segment.
(2) | For the years ended December 31, 2018, 2017 and 2016, all Saudi Aramco revenues were attributable to the Jackup segment.
(3) | For the year ended December 31, 2018, 27%, 53% and 20% of BP revenues were attributable to our Floater, Other and Jackup segments, respectively. For the year ended December 31, 2017, 78% of BP revenues were attributable to our Floater segment and the remaining revenues were attributable to our Other segment. For the year ended December 31, 2016, 76%, 17% and 7% of BP revenues were attributable to our Floater, Other and Jackup segments, respectively.
For purposes of our geographic disclosure, we attribute revenues to the geographic location where such revenues are earned. Consolidated revenues by region, including the United Kingdom, our country of domicile, for the years ended December 31, 2018, 2017 and 2016 were as follows (in millions):
|  | 2018 |  | 2017 |  | 2016
Angola(1) |  | $ | 285.7 |  |  | $ | 445.7 |  |  | $ | 552.1 |
Australia(2) |  | 283.9 |  |  | 206.7 |  |  | 222.8 |
U.S. Gulf of Mexico(3) |  | 214.7 |  |  | 149.8 |  |  | 531.7 |
United Kingdom(4) |  | 192.6 |  |  | 164.6 |  |  | 246.2 |
Saudi Arabia(4) |  | 182.2 |  |  | 171.8 |  |  | 210.6 |
Brazil(5) |  | 139.6 |  |  | 196.2 |  |  | 298.0 |
Egypt(5) |  | 31.2 |  |  | 214.8 |  |  | 141.2 |
Other |  | 375.5 |  |  | 293.4 |  |  | 573.8 |
|  | $ | 1,705.4 |  |  | $ | 1,843.0 |  |  | $ | 2,776.4 |
(1) | For the years ended December 31, 2018, 2017 and 2016, 86%, 88% and 87% of revenues earned in Angola, respectively, were attributable to our Floaters segment with the remaining revenues attributable to our Jackup segment.
(2) | For the years ended December 31, 2018, 2017 and 2016, 92%, 87% and 95% of revenues earned in Australia, respectively, were attributable to our Floaters segment with the remaining revenues attributable to our Jackup segment.
(3) | For the years ended December 31, 2018, 2017 and 2016, 30%, 29% and 82% of revenues earned in the U.S. Gulf of Mexico, respectively, were attributable to our Floaters segment, 42%, 31% and 7% of revenues were attributable to our Jackup segment, respectively, and the remaining revenues were attributable to our Other segment, respectively.
(4) | For the years ended December 31, 2018, 2017 and 2016, all revenues were attributable to our Jackup segment.
(5) | For the years ended December 31, 2018, 2017 and 2016, all revenues were attributable to our Floater segment.

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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI http://asc.fasb.org/topic&trid=2122208 + Details
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