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Supplemental Financial Information Revenue from External Customers by Geographic Areas (Details) - Sales Revenue, Services, Net - Geographic Concentration Risk - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenues | $ 458.5 | $ 457.5 | $ 875.5 | $ 928.6
ANGOLA |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenues | 72.2 | 115.9 | 133.3 | 237.6
EGYPT |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenues | 0.0 | 53.4 | 31.2 | 106.6
BRAZIL |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenues | 46.1 | 48.7 | 96.4 | 96.5
UNITED KINGDOM |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenues | 53.7 | 36.7 | 100.3 | 67.9
AUSTRALIA |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenues | 80.4 | 55.3 | 132.6 | 109.9
US Gulf Of Mexico |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenues | 59.5 | 33.0 | 113.1 | 77.3
Other |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenues | $ 146.6 | $ 114.5 | $ 268.6 | $ 232.8
Floaters | ANGOLA |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 84.00% | 87.00% | 90.00% | 86.00%
Floaters | AUSTRALIA |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 95.00% | 78.00% | 97.00% | 78.00%
Floaters | US Gulf Of Mexico |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 36.00% | 10.00% |  | 25.00%
Jackups | US Gulf Of Mexico |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage | 39.00% | 46.00% |  | 37.00%
Floaters & Jackups [Member] | US Gulf Of Mexico |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Concentration risk, percentage |  |  | 37.00% |

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