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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
Information with respect to the discontinued operations        
Revenues $ 0 $ 5.8 $ 0 $ 11.3
Net loss from discontinued operations, net of tax 0 (17.4) 0 (17.8)
Income tax benefit from discontinued operations $ 0 $ (10.3) $ 0 $ (10.4)