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Fair Value Measurements (Financial Instruments Recorded at Fair Value) (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2014
Cash and cash equivalents $ 170.8 $ 234.0 $ 180.3 $ 218.8
Deferred compensation asset 1.1 1.5    
Deferred compensation obligation 1.1 1.4    
Level 1 [Member]        
Cash and cash equivalents 170.8 234.0    
Deferred compensation asset 1.1      
Deferred compensation obligation $ 1.1      
Level 2 [Member]        
Deferred compensation asset   1.5    
Deferred compensation obligation   $ 1.4