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Goodwill And Intangible Assets (Changes To Intangible Assets) (Detail) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Goodwill [Roll Forward]    
Balance at beginning of period, net of accumulated amortization $ 71.7 $ 78.5
Amortization expense (4.2) (5.7)
Currency translation and other (0.1) (1.1)
Balance at end of period, net of accumulated amortization $ 67.4 $ 71.7