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International Risk Factors (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) item | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Jun. 30, 2010 item
International Risk Factors |  |  |  |
Period for which cumulative inflation rates used for considering country as highly inflationary | 3 years |  |  |
Foreign currency gains (losses) | $ | $ (1.5) | $ (1.4) |  |
Venezuela |  |  |  |
International Risk Factors |  |  |  |
Number of rigs expropriated by Venezuelan government | item |  |  |  | 11
Argentina |  |  |  |
International Risk Factors |  |  |  |
Foreign currency gains (losses) | $ |  |  | $ (8.5) |
Operating revenues | Geographic concentration risk | South America |  |  |  |
International Risk Factors |  |  |  |
Concentration percentage | 96.20% |  |  |
Minimum |  |  |  |
International Risk Factors |  |  |  |
Cumulative inflation rate before a country is considered highly inflationary (as a percent) | 100.00% |  |  |
Number of geographical areas of operation to minimize risks | item | 1 |  |  |
Contract Drilling: | Operating revenues | Geographic concentration risk | International locations |  |  |  |
International Risk Factors |  |  |  |
Concentration percentage | 11.20% |  |  |

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