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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
Mar. 31, 2012
Dec. 31, 2011
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Supplemental executive retirement plan assets $ 28.1 $ 25.6
Derivatives, net 1.1  
Total financial assets 29.2 57.8
Hercules Offshore, Inc. common stock   32.2
Derivatives, net   7.1
Total Financial Liabilities   7.1
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 28.1 25.6
Derivatives, net 0  
Total financial assets 28.1 57.8
Hercules Offshore, Inc. common stock   32.2
Derivatives, net   0
Total Financial Liabilities   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 1.1  
Total financial assets 1.1 0
Hercules Offshore, Inc. common stock   0
Derivatives, net   7.1
Total Financial Liabilities   7.1
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
Hercules Offshore, Inc. common stock   0
Derivatives, net   0
Total Financial Liabilities   $ 0