| 
           Income Taxes NOL (Details) (USD $) 
        In Millions, unless otherwise specified  | 
        12 Months Ended | ||
|---|---|---|---|
| 
           Dec. 31, 2011 
         | 
        
           Dec. 31, 2011
 
          Federal [Member] 
         | 
        
           Sep. 30, 2010
 
          Federal [Member] 
         | 
      |
| Operating Loss Carryforwards [Line Items] | |||
| Existing NOL subject to annual NOL utilization limitation | $ 855 | ||
| Federal NOL | 595.4 | 855.0 | |
| Future Benefit to be reflected in APIC | $ 21.2 | 
| X | ||||||||||
| 
             
- Definition 
          Estimated Future Benefit, Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation No definition available. 
  | 
        
| X | ||||||||||
| 
             
- Definition 
          Operating Loss Carryforwards, Subject to Annual Utilization Limitation No definition available. 
  | 
        
| X | ||||||||||
| 
             
- Definition 
          The sum of domestic, foreign and state and local operating loss carryforwards, before tax effects, available to reduce future taxable income under enacted tax laws. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
  | 
        
| X | ||||||||||
| 
             
- Details 
          
  |