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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

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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