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Quarterly report pursuant to Section 13 or 15(d)

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

 v2.3.0.11
Goodwill and Other Intangible Assets and Liabilities (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2010
Dec. 31, 2009
Increase in balance of Goodwill $ 1,026.8 Ìý $ 1,026.8 Ìý $ 111.9 [1] Ìý
Goodwill 1,227.3 Ìý 1,227.3 Ìý 196.5 [1] 74.6 [1]
Amortization expense relating to intangible assets 4.7 4.3 9.6 8.3 Ìý Ìý
Revenues 1,705.0 1,116.2 2,838.0 1,787.7 Ìý Ìý
Upper Limit [Member]
Ìý Ìý Ìý Ìý Ìý Ìý
Below-market sales contracts life (in years) 8.5 Ìý 8.5 Ìý Ìý Ìý
Lower Limit [Member]
Ìý Ìý Ìý Ìý Ìý Ìý
Below-market sales contracts life (in years) 3.5 Ìý 3.5 Ìý Ìý Ìý
Below Market Sales Contracts [Member]
Ìý Ìý Ìý Ìý Ìý Ìý
Revenues $ 16.6 $ 11.8 $ 23.7 $ 11.8 Ìý Ìý
[1] Represents a 12-month rollforward of our goodwill by reportable unit at December 31, 2010.