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Fair Value Measurements (Financial Instruments Recorded at Fair Value) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Cash equivalents $ 228.6 $ 37.4
Deferred compensation asset 2.6 2.3
Deferred compensation obligation 2.9 2.6
Level 2 [Member]
   
Cash equivalents 228.6 37.4
Deferred compensation asset 2.6 2.3
Deferred compensation obligation $ 2.9 $ 2.6