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Leases - Components of Lease Expense (Detail)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Finance lease cost:  
Amortization of right-of-use assets $ 0.6
Interest on lease liabilities 0.0
Total finance lease cost 0.6
Operating lease cost 3.0
Short-term lease cost 0.4
Variable lease cost 0.1
Sub-lease income 0.0
Total lease cost $ 4.1