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Discontinued Operations (Details) (USD $)
In Millions
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2010
Discontinued Operations          
Revenue from discontinued operations $ 0.60 $ 1.00 $ 1.60 $ 2.00  
Gross property included in discontinued operations         40.6
Accumulated depreciation for property included in discontinued operations         9.4
Impairment loss included in discontinued operations $ 2.4 $ 0 $ 2.8 $ 0  
Interest expense allocated to discontinued operations    

We do not allocate other consolidated interest to discontinued operations because the interest savings to be realized from the proceeds of the sale of these operations is not material.