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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 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Earnings Per Share [Abstract]            
Net income before allocation to noncontrolling interest $ 50.5 $ 47.1 $ 41.6 $ 37.8 $ 97.1 $ 126.5
Average basic shares outstanding (in shares) 57.4 57.2     57.4 57.1
Effect of dilutive share-based awards (in shares) 0.6 0.6     0.6 0.7
Average diluted shares outstanding (in shares) 58.0 57.8     58.0 57.8
Earnings per basic share (in dollars per share) $ 0.88 $ 0.82     $ 1.69 $ 2.21
Earnings per diluted share (in dollars per share) $ 0.87 $ 0.81     $ 1.68 $ 2.19
Average options excluded from computation of diluted earnings per share 0.2       0.3