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Fair Value Measurements (Financial Instruments Recorded at Fair Value) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Cash equivalents $ 127.9 $ 292.2
Deferred compensation asset 3.0 2.7
Deferred compensation obligation 2.8 2.7
Level 2 [Member]
   
Cash equivalents 127.9 292.2
Deferred compensation asset 3.0 2.7
Deferred compensation obligation $ 2.8 $ 2.7