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Fair Value Measurements (Financial Instruments Recorded at Fair Value) (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Cash and cash equivalents $ 174.5 $ 234.0 $ 218.5 $ 218.8
Deferred compensation asset 1.4 1.5    
Deferred compensation obligation 1.2 1.4    
Level 1 [Member]        
Cash and cash equivalents 174.5 234.0    
Level 2 [Member]        
Deferred compensation asset 1.4 1.5    
Deferred compensation obligation $ 1.2 $ 1.4