Quarterly report pursuant to Section 13 or 15(d)

Fair Value Disclosures (Financial Assets and Liabilities Measured at Fair Value) (Details)

v2.4.0.6
Fair Value Disclosures (Financial Assets and Liabilities Measured at Fair Value) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 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