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Leases - Summary of Minimum Lease Payments for Operating Lease Liabilities (Detail) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Leases [Abstract]
2020 (9 months remaining)	$ 6.5
2021	10.6
2022	10.9
2023	11.2
2024	11.6
Thereafter	79.7
Total operating lease payments	130.5
Less accreted interest	36.1
Operating Lease, Liability	94.4
Less current operating lease liabilities	8.8
Noncurrent operating lease liabilities	$ 85.6	$ 86.7

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