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Supplemental Financial Information (Accumulated Other Comprehensive Income) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Supplemental Financial Information [Abstract]    
Derivative Instruments $ (4.4)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax $ 8.0us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
Other 6.5esv_AccumulatedOtherComprehensiveIncomeLossOtherNetOfTax 3.9esv_AccumulatedOtherComprehensiveIncomeLossOtherNetOfTax
Accumulated other comprehensive income $ 2.1us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ 11.9us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax