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Leases - Other Information Related to Leases (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Cash paid for amounts included in the measurement of lease liabilities:  
Operating cash flows from operating leases $ 41.3
Right-of-use assets obtained in exchange for operating lease obligations $ 24.5
Weighted average remaining lease term - operating leases 7 years 1 month 6 days
Weighted average discount rate - operating leases 4.20%