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International Risk Factors (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2015 USD ($) item | Dec. 31, 2014 USD ($) | Jun. 30, 2010 item
Number of rigs expropriated by Venezuelan government |  |  | 11
Foreign currency losses | $ | $ 8.5 | $ (1.5) |
Operating revenues | Geographic concentration risk | South America |  |  |
Concentration percentage | 83.80% |  |
Minimum |  |  |
Number of geographical areas of operation to minimize risks | 1 |  |
Contract Drilling: | Operating revenues | Geographic concentration risk | International locations |  |  |
Concentration percentage | 14.80% |  |

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