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Fair Value Measurements (Financial Instruments Recorded at Fair Value) (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Cash and cash equivalents $ 140.1 $ 208.8
Deferred compensation asset 1.5 1.4
Deferred compensation obligation 1.5 1.4
Level 1 [Member]    
Deferred compensation asset 1.5 1.4
Deferred compensation obligation $ 1.5 $ 1.4