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Goodwill and Other Intangible Assets - Narrative (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Goodwill And Intangible Assets Disclosure [Abstract]        
Amortization expense for other intangible assets $ 5.9 $ 6.8 $ 18.1 $ 20.7