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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	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Supplemental executive retirement plan assets	$ 27.7	$ 33.1
Total financial assets	27.7	33.1
Derivative Assets (Liabilities), at Fair Value, Net	(8.8)	(19.7)
Financial Liabilities Fair Value Disclosure	(8.8)	(19.7)
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	27.7	33.1
Total financial assets	27.7
Derivative Assets (Liabilities), at Fair Value, Net	0.0	0.0
Financial Liabilities Fair Value Disclosure	0.0	0.0
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	0.0
Total financial assets	0.0	0.0
Derivative Assets (Liabilities), at Fair Value, Net	(8.8)	(19.7)
Financial Liabilities Fair Value Disclosure	(8.8)	(19.7)
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	0.0
Total financial assets	0.0	0.0
Derivative Assets (Liabilities), at Fair Value, Net	0.0	0.0
Financial Liabilities Fair Value Disclosure	$ 0.0	$ 0.0

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Fair Value Measured On Recurring Basis Supplemental Executive Retirement Plan Assets

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Total Financial Assets

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- Definition

Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

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Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities.

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