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Description of the Business, Basis of Presentation and Recently Adopted Accounting Pronouncements (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Recently Adopted Accounting Pronouncements  
Decrease in depreciation expense $ 4.9
Decrease in depreciation expense after tax $ 3.2
Decrease in depreciation expense per diluted common share $ 0.10