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Fair Value Measurements (Financial Instruments Recorded at Fair Value) (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Cash and cash equivalents $ 88.3 $ 123.1
Cash and cash equivalents 88.3 123.1
Deferred compensation asset 1.7 1.4
Deferred compensation obligation 1.7 1.4
Level 1 [Member]    
Cash and cash equivalents   123.1
Deferred compensation asset 1.7 1.4
Deferred compensation obligation $ 1.7 $ 1.4