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Leases - Components of Lease Expense (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Finance lease cost:    
Amortization of right-of-use assets $ 0.4 $ 1.0
Interest on lease liabilities 0.0 0.0
Total finance lease cost 0.4 1.0
Operating lease cost 3.0 6.0
Short-term lease cost 0.5 0.9
Variable lease cost 0.1 0.2
Sub-lease income 0.0 0.0
Total finance lease cost $ 4.0 $ 8.1