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Goodwill and Other Intangible Assets - Schedule of Estimated Annual Amortization Expense Related to Other Intangible Assets (Detail) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract]    
2020 (excluding the three months ended March 31, 2020) $ 8.9  
2021 0.9  
2022 0.9  
2023 0.9  
2024 0.7  
2025 and thereafter 6.1  
Total Net Book Value $ 18.4 $ 21.9