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Leases - Other Information Related to Leases (Detail)
$ in Millions
9 Months Ended
Sep. 30, 2019
USD ($)
Cash paid for amounts included in the measurement of lease liabilities:  
Operating cash flows from operating leases $ 30.4
Right-of-use assets obtained in exchange for operating lease obligations $ 13.5
Weighted average remaining lease term - operating leases 7 years 2 months 12 days
Weighted average discount rate - operating leases 4.40%