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Fair Value Measurements (Financial Instruments Recorded at Fair Value) (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Cash and cash equivalents $ 234.0 $ 218.8
Deferred compensation asset 1.5 3.2
Deferred compensation obligation 1.4 3.0
Level 2 [Member]    
Deferred compensation asset 1.5 3.2
Deferred compensation obligation $ 1.4 $ 3.0