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Supplemental Financial Information (Tables) | 9 Months Ended
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Sep. 30, 2016
Supplemental Financial Information [Abstract] |
Accounts Receivable, Net | Accounts receivable, net, consisted of the following (in millions):
| September 30, 2016 |  | December 31, 2015
Trade | $ | 355.7 |  |  | $ | 595.0 |
Other | 21.5 |  |  | 16.3 |
| 377.2 |  |  | 611.3 |
Allowance for doubtful accounts | (25.1 | ) |  | (29.3 | )
| $ | 352.1 |  |  | $ | 582.0 |
Other Current Assets | Other current assets consisted of the following (in millions):
| September 30, 2016 |  | December 31, 2015
Inventory | $ | 231.3 |  |  | $ | 235.3 |
Prepaid taxes | 51.2 |  |  | 73.5 |
Deferred costs | 34.9 |  |  | 52.1 |
Prepaid expenses | 11.7 |  |  | 20.5 |
Assets held-for-sale | 2.4 |  |  | 5.5 |
Other | 14.7 |  |  | 14.9 |
| $ | 346.2 |  |  | $ | 401.8 |
Other Assets, Net | Other assets, net, consisted of the following (in millions):
| September 30, 2016 |  | December 31, 2015
Deferred tax assets | $ | 67.5 |  |  | $ | 94.8 |
Deferred costs | 38.9 |  |  | 55.8 |
Prepaid taxes on intercompany transfers of property | 33.4 |  |  | 37.1 |
Supplemental executive retirement plan assets | 28.3 |  |  | 33.1 |
Other | 8.8 |  |  | 16.8 |
| $ | 176.9 |  |  | $ | 237.6 |
Accrued Liabilities And Other | Accrued liabilities and other consisted of the following (in millions):
| September 30, 2016 |  | December 31, 2015
Deferred revenue | $ | 135.1 |  |  | $ | 197.2 |
Personnel costs | 116.1 |  |  | 161.6 |
Accrued interest | 70.2 |  |  | 88.4 |
Taxes | 65.0 |  |  | 70.8 |
Derivative liabilities | 10.7 |  |  | 21.6 |
Other | 11.0 |  |  | 11.3 |
| $ | 408.1 |  |  | $ | 550.9 |
Other Liabilities | Other liabilities consisted of the following (in millions):
| September 30, 2016 |  | December 31, 2015
Unrecognized tax benefits (inclusive of interest and penalties) | $ | 154.0 |  |  | $ | 149.7 |
Deferred revenue | 139.2 |  |  | 218.6 |
Supplemental executive retirement plan liabilities | 29.4 |  |  | 34.4 |
Personnel costs | 11.3 |  |  | 17.7 |
Deferred tax liabilities | 9.3 |  |  | 4.4 |
Other | 10.9 |  |  | 24.4 |
| $ | 354.1 |  |  | $ | 449.2 |
Accumulated other comprehensive income | Accumulated other comprehensive income consisted of the following (in millions):
| September 30, 2016 |  | December 31, 2015
Derivative instruments | $ | 16.1 |  |  | $ | 6.6 |
Currency translation adjustment | 7.6 |  |  | 7.8 |
Other | (2.2 | ) |  | (1.9 | )
| $ | 21.5 |  |  | $ | 12.5 |
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block] | Consolidated revenues by customer for the three-month and nine-month periods ended September 30, 2016 and 2015 were as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2016 |  | 2015 |  | 2016 |  | 2015
Total(1) | 23 | % |  | 7 | % |  | 16 | % |  | 8 | %
BP (2)(3) | 13 | % |  | 27 | % |  | 12 | % |  | 18 | %
Petrobras(1) | 9 | % |  | 16 | % |  | 11 | % |  | 14 | %
ConocoPhillips(4) | 2 | % |  | 6 | % |  | 12 | % |  | 4 | %
Other | 53 | % |  | 44 | % |  | 49 | % |  | 56 | %
| 100 | % |  | 100 | % |  | 100 | % |  | 100 | %
(1) | During the three-month and nine-month periods ended September 30, 2016 and 2015, all revenues were attributable to our Floater segment.
(2) | During the three-month periods ended September 30, 2016 and 2015, 73% and 86% of the revenues provided by BP, respectively, were attributable to our Floaters segment. During the nine-month periods ended September 30, 2016 and 2015, 75% and 84% of the revenues provided by BP, respectively, were attributable to our Floaters segment.
(3) | During the three-month and nine-month periods ended September 30, 2015, excluding the impact of ENSCO DS-4 lump-sum termination payments of $110.6 million, revenues from BP represented 18% and 15%, respectively.
(4) | During the nine-month period ended September 30, 2016, excluding the impact of the ENSCO DS-9 lump-sum termination payment of $185.0 million, revenues from ConocoPhillips represented 3% of our consolidated revenues.
Revenue from External Customers by Geographic Areas [Table Text Block] | Consolidated revenues by region for the three-month and nine-month periods ended September 30, 2016 and 2015 were as follows (in millions):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2016 |  | 2015 |  | 2016 |  | 2015
Angola(1) | $ | 142.7 |  |  | $ | 136.6 |  |  | $ | 411.3 |  |  | $ | 488.3 |
United Kingdom(2) | 60.5 |  |  | 91.5 |  |  | 204.0 |  |  | 316.4 |
Brazil(3) | 48.6 |  |  | 112.9 |  |  | 251.3 |  |  | 351.3 |
U.S. Gulf of Mexico(4) | 33.6 |  |  | 363.0 |  |  | 498.3 |  |  | 972.8 |
Other | 262.8 |  |  | 308.2 |  |  | 906.9 |  |  | 1,106.3 |
| $ | 548.2 |  |  | $ | 1,012.2 |  |  | $ | 2,271.8 |  |  | $ | 3,235.1 |
(1) | During the three-month periods ended September 30, 2016 and 2015, 87% of the revenues earned in Angola were attributable to our Floaters segment. During the nine-month period ended September 30, 2016 and 2015, 87% and 90% of the revenues earned in Angola, respectively, were attributable to our Floaters segment.
(2) | During the three-month and nine-month periods ended September 30, 2016 and 2015, all revenues were attributable to our Jackups segment.

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