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Fair Value Disclosures (Financial Assets and Liabilities Measured at Fair Value) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets: SERP	$ 2.1	$ 1.7
Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets: SERP	0	0
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets: SERP	2.1	1.7
Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets: SERP	$ 0	$ 0

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X

- Definition

Fair Value Assets Measured On Recurring Basis Supplemental Executive Retirement Program

+ References

No definition available.

+ Details

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