Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies and Basis of Presentation Summary of Significant Accounting Policies and Baiss of Presentation (Details)

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Summary of Significant Accounting Policies and Basis of Presentation Summary of Significant Accounting Policies and Baiss of Presentation (Details) (Reclassification Errors [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2012
Jun. 30, 2011
Mar. 31, 2011
Jun. 30, 2011
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Reclassification Errors [Member]
             
Impairment charges and acquisitions costs reclassifications $ 0.1 $ 0.3 $ 1.6 $ 2.0 $ 18.1 $ 1.2 $ 0.8