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Commitments and Contingencies (Details) - USD ($) $ in Millions | Apr. 28, 2015 | Jun. 30, 2016
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Purchase obligations |  |
Purchase orders outstanding for drilling equipment |  | $ 4.9
Gain contingencies recognized in consolidated financial statements |  | $ 0.0
Pending litigation | Minimum | Keel accident case |  |
Commitments and Contingencies |  |
Damages value | $ 100.0 |

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