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Fair Value Measurements (Financial Instruments Recorded at Fair Value) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Cash and cash equivalents $ 201.2 $ 179.9
Cash and cash equivalents 201.2 179.9
Deferred compensation asset 3.3 2.4
Deferred compensation obligation 3.3 2.4
Fair Value, Inputs, Level 1 [Member]    
Cash and cash equivalents 201.2 179.9
Deferred compensation asset 3.3 2.4
Deferred compensation obligation 3.3 2.4
Fair Value, Inputs, Level 2 [Member]    
Cash and cash equivalents 0.0 0.0
Deferred compensation asset 0.0 0.0
Deferred compensation obligation 0.0 0.0
Fair Value, Inputs, Level 3 [Member]    
Cash and cash equivalents 0.0 0.0
Deferred compensation asset 0.0 0.0
Deferred compensation obligation $ 0.0 $ 0.0