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Leases - Supplemental Cash Flow Information Related to Leases (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows from operating leases $ 1.5 $ 11.2
Operating cash flows from finance leases 0.4  
Financing cash flows from finance leases 3.3 0.4
Lease assets obtained in exchange for new lease liabilities:    
Operating leases $ 4.4 3.7
Financing leases   $ 8.8