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Commitments and Contingencies (Details) - USD ($) $ in Millions	Sep. 30, 2016	Apr. 28, 2015	Mar. 31, 2017
Purchase obligations
Purchase orders outstanding for drilling equipment			$ 73.0
Gain contingencies recognized in consolidated financial statements			0.0
CONTINGENCIES
Gain contingencies recognized in consolidated financial statements			$ 0.0
Judicial ruling | Keel accident case
CONTINGENCIES
Litigation settlement	$ 72.0
Judicial ruling | Minimum | Keel accident case
CONTINGENCIES
Damages value		$ 100.0

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Amount of gain recognized in the period that had been disclosed in prior periods as a contingent gain.

+ References

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Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

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