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Leases - Components of Lease Expense (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Lease Cost    
Operating lease cost $ 1.2 $ 2.3
Financing lease cost:    
Depreciation of lease assets 0.3 0.2
Interest on lease liabilities 0.1 0.1
Sublease income (0.6) (1.0)
Total lease cost, net $ 1.0 $ 1.6