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Other Intangible Assets (Narrative) (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Intangible Assets Net Excluding Goodwill [Abstract]        
Amortization expense $ 12.8 $ 11.6 $ 36.6 $ 31.4