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Fair Value Measurements (Financial Instruments Recorded at Fair Value) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Cash and cash equivalents $ 152.0 $ 130.7
Cash and cash equivalents 152.0 130.7
Deferred compensation asset 2.4 1.8
Deferred compensation obligation 2.3 1.8
Level 1 [Member]    
Cash and cash equivalents   130.7
Deferred compensation asset 2.4 1.8
Deferred compensation obligation $ 2.3 $ 1.8