Annual report pursuant to Section 13 and 15(d)

Hurricane Remediation And Insurance Claims (Narrative) (Details)

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Hurricane Remediation And Insurance Claims (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended 42 Months Ended
Dec. 31, 2008
Sep. 30, 2008
Dec. 31, 2011
Dec. 31, 2011
Hurricane Remediation And Insurance Claims [Abstract]        
Retention amount per occurrence $ 10 $ 10    
Maximum insurance coverage policy limit due to named windstorms for per incident     150  
Maximum insurance coverage policy limit except for, property damage due to named windstorms     250  
Insurance recoveries related to hurricanes       $ 139.3