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Supplemental Financial Information (Tables) | 3 Months Ended
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Mar. 31, 2018
Supplemental Financial Information [Abstract] |
Accounts Receivable, Net | Accounts receivable, net, consisted of the following (in millions):
| March 31, 2018 |  | December 31, 2017
Trade | $ | 303.1 |  |  | $ | 335.4 |
Other | 23.9 |  |  | 33.6 |
| 327.0 |  |  | 369.0 |
Allowance for doubtful accounts | (22.9 | ) |  | (23.6 | )
| $ | 304.1 |  |  | $ | 345.4 |
Other Current Assets | Other current assets consisted of the following (in millions):
| March 31, 2018 |  | December 31, 2017
Inventory | $ | 281.9 |  |  | $ | 278.8 |
Prepaid taxes | 47.3 |  |  | 43.5 |
Deferred costs | 38.8 |  |  | 29.7 |
Prepaid expenses | 14.2 |  |  | 14.2 |
Derivative asset | 7.1 |  |  | 6.8 |
Assets held-for-sale | 5.2 |  |  | 1.5 |
Other | 15.7 |  |  | 6.7 |
| $ | 410.2 |  |  | $ | 381.2 |
Other Assets, Net | Other assets, net, consisted of the following (in millions):
| March 31, 2018 |  | December 31, 2017
Deferred costs | $ | 30.9 |  |  | $ | 37.4 |
Supplemental executive retirement plan assets | 30.1 |  |  | 30.9 |
Deferred tax assets | 28.1 |  |  | 38.8 |
Intangible assets | 14.2 |  |  | 15.7 |
Other | 16.9 |  |  | 17.4 |
| $ | 120.2 |  |  | $ | 140.2 |
Accrued Liabilities And Other | Accrued liabilities and other consisted of the following (in millions):
| March 31, 2018 |  | December 31, 2017
Personnel costs | $ | 95.2 |  |  | $ | 112.0 |
Deferred revenue | 78.0 |  |  | 71.9 |
Accrued interest | 75.0 |  |  | 83.1 |
Taxes | 58.2 |  |  | 46.4 |
Other | 15.4 |  |  | 12.5 |
| $ | 321.8 |  |  | $ | 325.9 |
Other Liabilities | Other liabilities consisted of the following (in millions):
| March 31, 2018 |  | December 31, 2017
Unrecognized tax benefits (inclusive of interest and penalties) | $ | 182.6 |  |  | $ | 178.0 |
Intangible liabilities | 59.1 |  |  | 59.6 |
Deferred revenue | 42.1 |  |  | 51.2 |
Supplemental executive retirement plan liabilities | 31.1 |  |  | 32.0 |
Deferred tax liabilities | 18.6 |  |  | 18.5 |
Personnel costs | 18.4 |  |  | 18.1 |
Deferred rent | 15.7 |  |  | 17.1 |
Other | 14.4 |  |  | 12.2 |
| $ | 382.0 |  |  | $ | 386.7 |
Accumulated other comprehensive income | Accumulated other comprehensive income consisted of the following (in millions):
| March 31, 2018 |  | December 31, 2017
Derivative instruments | $ | 23.0 |  |  | $ | 22.5 |
Currency translation adjustment | 7.8 |  |  | 7.8 |
Other | (1.8 | ) |  | (1.7 | )
| $ | 29.0 |  |  | $ | 28.6 |
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block] | Consolidated revenues by customer for the quarters ended March 31, 2018 and 2017 were as follows:
| March 31, 2018 |  | March 31, 2017
Total(1) | 14 | % |  | 22 | %
BP (2) | 12 | % |  | 14 | %
Petrobras(1) | 12 | % |  | 10 | %
Saudi Aramco(3) | 10 | % |  | 9 | %
Other | 52 | % |  | 45 | %
| 100 | % |  | 100 | %
(1) | During the quarters ended March 31, 2018 and 2017, all revenues were attributable to our Floaters segment.
(2) | During the quarter ended March 31, 2018, 61% of the revenues provided by BP were attributable to our Floaters segment while 10% of the revenues were attributable to our Jackups segment. During the quarter ended March 31, 2017, 79% of the revenues provided by BP were attributable to our Floaters segment.
(3) | During the quarters ended March 31, 2018 and 2017, all revenues were attributable to our Jackups segment.
Revenue from External Customers by Geographic Areas [Table Text Block] | Consolidated revenues by region for the quarters ended March 31, 2018 and 2017 were as follows:
| March 31, 2018 |  | March 31, 2017
Angola(1) | $ | 61.1 |  |  | $ | 121.7 |
U.S. Gulf of Mexico(2) | 53.6 |  |  | 44.3 |
Australia(3) | 52.2 |  |  | 54.6 |
Brazil(4) | 50.3 |  |  | 47.8 |
United Kingdom(5) | 46.6 |  |  | 31.2 |
Saudi Arabia(5) | 43.2 |  |  | 41.3 |
Egypt(4) | 31.0 |  |  | 53.2 |
Other | 79.0 |  |  | 77.0 |
| $ | 417.0 |  |  | $ | 471.1 |
(1) | During the quarters ended March 31, 2018 and 2017, 98% and 86% 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, 2018 and 2017, 38% and 37% of the revenues earned, respectively, were attributable to our Floaters segment and 34% and 30% of revenues earned, respectively, were attributable to our Jackups segment.
(3) | During the quarters ended March 31, 2018 and 2017, 100% and 78% of the revenues earned, respectively, were attributable to our Floaters segment. The remaining revenues were attributable our Jackups segment.
(4) During the quarters ended March 31, 2018 and 2017, all revenues were attributable to our Floaters segment. (5) During the quarters ended March 31, 2018 and 2017, all revenues were attributable to our Jackups segment.

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