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Quarterly report pursuant to Section 13 or 15(d)

Goodwill And Other Intangible Assets And Liabilities (Narrative) (Details)

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Goodwill And Other Intangible Assets And Liabilities (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2010
Dec. 31, 2009
Increase in balance of Goodwill 听 听 $ 1,045.8 听 $ 111.9 [1] 听
Goodwill 1,237.7 听 1,237.7 听 196.5 [1] 74.6 [1]
Amortization expense relating to intangible assets 3.3 5.6 12.5 13.5 听 听
Revenues 2,124.4 1,287.2 4,962.4 3,074.8 听 听
Upper Limit [Member]
 听 听 听 听 听 听
Below-market sales contracts life (in years) 8.5 听 8.5 听 听 听
Lower Limit [Member]
 听 听 听 听 听 听
Below-market sales contracts life (in years) 3.5 听 3.5 听 听 听
Below-Market Sales Contracts [Member]
 听 听 听 听 听 听
Revenues $ 16.7 $ 22.9 $ 40.4 $ 34.7 听 听
[1] Represents a 12-month rollforward of our goodwill by reportable unit at December 31, 2010.