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Fair Value Measurements (Financial Instruments Recorded at Fair Value) (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Cash and cash equivalents $ 135.9 $ 260.7
Deferred compensation asset 1.3 1.1
Deferred compensation obligation 1.3 1.1
Level 1 [Member]    
Deferred compensation asset 1.3 1.1
Deferred compensation obligation $ 1.3 $ 1.1