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Fair Value Measurements (Financial Instruments Recorded at Fair Value) (Details) (USD $)
In Millions
Sep. 30, 2011
Dec. 31, 2010
Deferred compensation asset$ 2.1$ 1.8
Deferred compensation obligation2.32.0
Convertible preferred stock85.978.2
Level 2 [Member]
  
Deferred compensation asset2.11.8
Deferred compensation obligation2.32.0
Level 3 [Member]
  
Convertible preferred stock$ 85.9$ 78.2