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Restructuring and Integration Costs (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Restructuring and Integration Costs    
Restructuring and integration costs   $ 2.1
Changes in the restructuring reserve    
Reserve balance at the beginning of the period 2.0 2.9
Employee termination expense   1.1
Cash payments (0.9) (1.6)
Reserve balance at the end of the period $ 1.1 $ 2.4