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Fair Value Measurements (Financial Instruments Recorded at Fair Value) (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Cash and cash equivalents $ 833.0 $ 671.4
Deferred compensation asset 0.4 0.4
Deferred compensation obligation 0.4 0.4
Fair Value, Inputs, Level 1 [Member]    
Deferred compensation asset 0.4 0.4
Deferred compensation obligation 0.4 0.4
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