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Earnings Per Share (Computation Of Basic and Diluted Earnings Per Share) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Earnings Per Share [Abstract]          
Net income before allocation to noncontrolling interest $ 24.9 $ 41.6 $ 37.8 $ 46.6 $ 79.4
Average basic shares outstanding (in shares) 57.4 57.1   57.3 57.1
Effect of dilutive share-based awards (in shares) 0.5 0.7   0.6 0.6
Average diluted shares outstanding (in shares) 57.9 57.8   57.9 57.7
Earnings per basic share (in dollars per share) $ 0.43 $ 0.73   $ 0.81 $ 1.39
Earnings per diluted share (in dollars per share) $ 0.43 $ 0.72   $ 0.80 $ 1.38