Annual report pursuant to Section 13 and 15(d)

Related Parties (Narrative) (Details)

v2.4.0.6
Related Parties (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
years
Dec. 31, 2010
Dec. 31, 2002
Dec. 31, 2011
Noncurrent Assets [Member]
Dec. 31, 2010
Noncurrent Assets [Member]
Dec. 31, 2011
Empire [Member]
Dec. 31, 2010
Empire [Member]
Dec. 31, 2002
Empire [Member]
Dec. 31, 2001
Empire [Member]
Related Party Transaction [Line Items]                  
Accounts receivable and derivative assets related parties $ 180.4 $ 52.4              
Other current liabilities related parties 43.0                
Present value of other non-current assets       16.5 22.8        
Percent ownership interest               46.70% 46.70%
Noncontrolling Interest, Ownership Percentage by Parent               79.00%  
Indemnified obligations of related parties     120.0            
Present value of receivable           $ 26.5 $ 32.8    
Life of the supply agreement, years 12