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Fair Value Measurements (Financial Instruments Recorded at Fair Value) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Cash and cash equivalents $ 87.9 $ 123.1
Cash and cash equivalents 87.9 123.1
Deferred compensation asset 1.6 1.4
Deferred compensation obligation 1.6 1.4
Level 1 [Member]    
Cash and cash equivalents   123.1
Deferred compensation asset 1.6 1.4
Deferred compensation obligation $ 1.6 $ 1.4