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Fair Value Measurements (Financial Instruments Recorded at Fair Value) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Cash equivalents $ 302.5 $ 37.4
Deferred compensation asset 2.7 2.3
Deferred compensation obligation 3.0 2.6
Level 2 [Member]
   
Cash equivalents 302.5 37.4
Deferred compensation asset 2.7 2.3
Deferred compensation obligation $ 3.0 $ 2.6