Other Operational Expenses (Details) $ in Millions	9 Months Ended
	Sep. 30, 2016 USD ($)
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Oil and gas, subsidy charges	$ 15.3
Foreign Currency Items
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Other operational loss	6.0
ENSCO Deep Water Drilling Rig
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Loss on contract termination	20.0
Saxon Appalachian Rig
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Loss on contract termination	$ 7.5