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Supplemental Financial Information (Tables) | 3 Months Ended
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Mar. 31, 2019
Supplemental Financial Information [Abstract] |
Accounts Receivable, Net | 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 | 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, Net | 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 | 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 | 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 | 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 |
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block] | 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.
Revenue from External Customers by Geographic Areas [Table Text Block] | 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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