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Fair Value Measurements (Financial Instruments Recorded at Fair Value) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Cash and cash equivalents $ 260.7 $ 234.0
Deferred compensation asset 1.1 1.5
Deferred compensation obligation 1.1 1.4
Level 1 [Member]    
Deferred compensation asset 1.1  
Deferred compensation obligation $ 1.1  
Level 2 [Member]    
Deferred compensation asset   1.5
Deferred compensation obligation   $ 1.4