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Supplemental Financial Information | 3 Months Ended
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Mar. 31, 2019
Supplemental Financial Information [Abstract] |
Supplemental Financial Information | Supplemental Financial Information Condensed Consolidated Balance Sheet Information Accounts receivable, net, consisted of the following (in millions):
| March 31, 2019 |  | December 31, 2018
Trade | $ | 274.8 |  |  | $ | 301.7 |
Other | 42.2 |  |  | 46.4 |
| 317.0 |  |  | 348.1 |
Allowance for doubtful accounts | (3.3 | ) |  | (3.4 | )
| $ | 313.7 |  |  | $ | 344.7 |
Other current assets consisted of the following (in millions):
| March 31, 2019 |  | December 31, 2018
Materials and supplies | $ | 263.8 |  |  | $ | 268.1 |
Prepaid taxes | 35.0 |  |  | 35.0 |
Deferred costs | 28.2 |  |  | 23.5 |
Prepaid expenses | 9.7 |  |  | 15.2 |
Other | 18.1 |  |  | 19.1 |
| $ | 354.8 |  |  | $ | 360.9 |
Other assets consisted of the following (in millions):
| March 31, 2019 |  | December 31, 2018
Right-of-use assets | $ | 47.9 |  |  | $ | — |
Supplemental executive retirement plan assets | 29.3 |  |  | 27.2 |
Deferred tax assets | 27.8 |  |  | 29.4 |
Deferred costs | 19.1 |  |  | 21.5 |
Other | 18.1 |  |  | 19.7 |
| $ | 142.2 |  |  | $ | 97.8 |
Accrued liabilities and other consisted of the following (in millions):
| March 31, 2019 |  | December 31, 2018
Accrued interest | $ | 78.0 |  |  | $ | 100.6 |
Personnel costs | 61.9 |  |  | 82.5 |
Deferred revenue | 55.9 |  |  | 56.9 |
Income and other taxes payable | 50.3 |  |  | 36.9 |
Lease liabilities | 17.9 |  |  | — |
Accrued rig holding costs | 15.9 |  |  | 14.3 |
Derivative liabilities | 7.2 |  |  | 10.9 |
Other | 15.6 |  |  | 15.9 |
| $ | 302.7 |  |  | $ | 318.0 |
Other liabilities consisted of the following (in millions):
| March 31, 2019 |  | December 31, 2018
Unrecognized tax benefits (inclusive of interest and penalties) | $ | 173.1 |  |  | $ | 177.0 |
Deferred tax liabilities | 75.5 |  |  | 70.7 |
Intangible liabilities | 52.7 |  |  | 53.5 |
Lease liabilities | 41.1 |  |  | — |
Supplemental executive retirement plan liabilities | 30.3 |  |  | 28.1 |
Personnel costs | 27.8 |  |  | 25.1 |
Deferred revenue | 17.8 |  |  | 20.5 |
Deferred rent | — |  |  | 11.7 |
Other | 9.0 |  |  | 9.4 |
| $ | 427.3 |  |  | $ | 396.0 |
Accumulated other comprehensive income consisted of the following (in millions):
| March 31, 2019 |  | December 31, 2018
Derivative instruments | $ | 14.2 |  |  | $ | 12.6 |
Currency translation adjustment | 7.3 |  |  | 7.3 |
Other | (1.8 | ) |  | (1.7 | )
| $ | 19.7 |  |  | $ | 18.2 |
Concentration of Risk We are exposed to credit risk related to our receivables from customers, our cash and cash equivalents, our short-term 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 cash equivalents by focusing on diversification and quality of instruments. Cash equivalents consist of a portfolio of high-grade instruments. Custody of cash and cash equivalents is maintained at several well-capitalized financial institutions, and we monitor the financial condition of those financial institutions. We mitigate our credit risk relating to derivative counterparties through a variety of techniques, including transacting with multiple, high-quality financial institutions, thereby limiting our exposure to individual counterparties and by entering into International Swaps and Derivatives Association, Inc. ("ISDA") Master Agreements, which include provisions for a legally enforceable master netting agreement, with almost all of our derivative counterparties. 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. See "Note 5 - Derivative Instruments" for additional information on our derivatives. Consolidated revenues by customer for the quarters ended March 31, 2019 and 2018 were as follows:
| March 31, 2019 |  | March 31, 2018
Total(1) | 18 | % |  | 14 | %
Saudi Aramco(2) | 13 | % |  | 10 | %
BP (3) | 5 | % |  | 12 | %
Petrobras(4) | 5 | % |  | 12 | %
Other | 59 | % |  | 52 | %
| 100 | % |  | 100 | %
(1) | During the quarters ended March 31, 2019 and 2018, all revenues were attributable to our floaters segment.
(2) | During the quarters ended March 31, 2019 and 2018, all revenues were attributable to our jackups segment.
(3) | During the quarter ended March 31, 2019, 27% of the revenues were attributable to our jackups segment while 73% of the revenues were attributable to our managed rigs. During the quarter ended March 31, 2018, 61% of the revenues provided by BP were attributable to our floaters segment, 10% of the revenues were attributable to our jackups segment and the remainder was attributable to our managed rigs.
(4) | During the quarters ended March 31, 2019 and 2018, all revenues were attributable to our floaters segment.
Consolidated revenues by region for the quarters ended March 31, 2019 and 2018 were as follows:
| March 31, 2019 |  | March 31, 2018
Angola(1) | $ | 70.6 |  |  | $ | 61.1 |
Australia(2) | 67.3 |  |  | 52.2 |
U.S. Gulf of Mexico(3) | 54.7 |  |  | 53.6 |
Saudi Arabia(4) | 53.4 |  |  | 43.2 |
United Kingdom(4) | 43.4 |  |  | 46.6 |
Brazil(5) | 22.0 |  |  | 50.3 |
Other | 94.5 |  |  | 110.0 |
| $ | 405.9 |  |  | $ | 417.0 |
(1) | During the quarters ended March 31, 2019 and 2018, 86% and 98% of the revenues earned, respectively, were attributable to our floaters segment. The remaining revenues were attributable to our jackups segment.
(2) | During the quarters ended March 31, 2019 and 2018, 94% and 100% of the revenues earned, respectively, were attributable to our floaters segment. The remaining revenues were attributable our jackups segment.
(3) | During the quarters ended March 31, 2019 and 2018, 25% and 38% of the revenues earned, respectively, were attributable to our floaters segment, 45% and 34% of revenues earned, respectively, were attributable to our jackups segment and the remainder was attributable to our managed rigs.
(4) During the quarters ended March 31, 2019 and 2018, all revenues were attributable to our jackups segment. (5) During the quarters ended March 31, 2019 and 2018, all revenues were attributable to our floaters segment.

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