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Debt - Schedule of Future Principal Payments and Maturities of Indebtedness (Detail) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
2019 $ 5.1  
2020 6.8  
2021 6.8  
2022 6.8  
2023 6.8  
Thereafter 644.3  
Total debt $ 676.6 $ 678.3