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Fair Value Measurements (Financial Instruments Recorded at Fair Value) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Deferred compensation asset $ 2.3 $ 1.8
Deferred compensation obligation 2.6 2.0
Convertible preferred stock   78.2
Level 2 [Member]
   
Deferred compensation asset 2.3 1.8
Deferred compensation obligation 2.6 2.0
Level 3 [Member]
   
Convertible preferred stock   $ 78.2