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Fair Value Measurements (Schedule Of Financial Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Supplemental executive retirement plan assets	$ 43.2	$ 37.7
Derivatives, net		1.8us-gaap_DerivativeAssets
Total financial assets	43.2esv_TotalFinancialAssets	39.5esv_TotalFinancialAssets
Derivative Assets (Liabilities), at Fair Value, Net	(26.3)
Financial Liabilities Fair Value Disclosure	(26.3)
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Supplemental executive retirement plan assets	43.2	37.7
Derivatives, net		0
Total financial assets	43.2	37.7
Derivative Assets (Liabilities), at Fair Value, Net	0
Financial Liabilities Fair Value Disclosure	0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Supplemental executive retirement plan assets	0	0
Derivatives, net		1.8
Total financial assets	0	1.8
Derivative Assets (Liabilities), at Fair Value, Net	(26.3)
Financial Liabilities Fair Value Disclosure	(26.3)
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Supplemental executive retirement plan assets	0	0
Derivatives, net		0
Total financial assets	0	0
Derivative Assets (Liabilities), at Fair Value, Net	0
Financial Liabilities Fair Value Disclosure	$ 0

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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