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Leases - Other Information Related to Leases (Detail)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Cash paid for amounts included in the measurement of lease liabilities:  
Operating cash flows from operating leases $ 10.0
Right-of-use assets obtained in exchange for operating lease obligations:  
Operating leases $ 7.7
Weighted average remaining lease term - operating leases  
Operating leases 7 years 8 months 12 days
Weighted average discount rate - operating leases  
Operating leases 4.40%