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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Income taxes (Textual) [Abstract]        
Provision for income taxes $ 9.7 $ 3.9 $ 21.1 $ 12.5
Increase (decrease) in provision for income taxes $ 5.8   $ 8.6  
Federal statutory rate 35.00%   35.00%