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Fair Value Measurements (Financial Instruments Recorded at Fair Value) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Cash and cash equivalents $ 292.2 $ 37.4
Deferred compensation asset 2.7 2.3
Deferred compensation obligation 2.7 2.6
Level 2 [Member]
   
Cash and cash equivalents 292.2 37.4
Deferred compensation asset 2.7 2.3
Deferred compensation obligation $ 2.7 $ 2.6