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Supplemental Financial Information Revenue from External Customers by Geographic Areas (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Sales Revenue, Services, Net [Member] | Geographic Concentration Risk [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | $ 457.5 | $ 909.6 | $ 928.6 | $ 1,723.6
Angola [Member] | Sales Revenue, Services, Net [Member] | Geographic Concentration Risk [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 115.9 | 132.4 | 237.6 | 268.6
AUSTRALIA | Sales Revenue, Services, Net [Member] | Geographic Concentration Risk [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 55.3 | 62.3 | 109.9 | 124.8
EGYPT | Sales Revenue, Services, Net [Member] | Geographic Concentration Risk [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 53.4 | 36.5 | 106.6 | 36.5
Brazil [Member] | Sales Revenue, Services, Net [Member] | Geographic Concentration Risk [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 48.7 | 81.7 | 96.5 | 202.7
United Kingdom [Member] | Sales Revenue, Services, Net [Member] | Geographic Concentration Risk [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 36.7 | 69.7 | 67.9 | 143.5
US Gulf Of Mexico [Member] | Sales Revenue, Services, Net [Member] | Geographic Concentration Risk [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 33.0 | 304.5 | 77.3 | 464.7
Other Geographic Areas [Member] | Sales Revenue, Services, Net [Member] | Geographic Concentration Risk [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | $ 114.5 | $ 222.5 | $ 232.8 | $ 482.8
Floaters [Member] | Angola [Member] | Sales Revenue, Services, Net [Member] | Geographic Concentration Risk [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 87.00% | 88.00% | 86.00% | 87.00%
Floaters [Member] | AUSTRALIA | Sales Revenue, Services, Net [Member] | Geographic Concentration Risk [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 78.00% |  |  |
Floaters [Member] | US Gulf Of Mexico [Member] | Sales Revenue, Services, Net [Member] | Geographic Concentration Risk [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 10.00% | 25.00% | 92.00% | 89.00%
Jackup [Member] | US Gulf Of Mexico [Member] | Sales Revenue, Services, Net [Member] | Geographic Concentration Risk [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 46.00% | 3.00% | 37.00% | 4.00%
Sales Revenue, Net [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Gain (Loss) on Contract Termination |  |  | $ 205.0 |

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