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Schedule of Cash Flow 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 $ 17.0
Operating cash flows from finance leases 0.2
Financing cash flows from finance leases 1.0
Right-of-use assets obtained in exchange for lease liabilities  
Operating leases 8.9
Finance leases $ 0.7