Leases - Summary of Location and Amount of Lease Expense (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Lease Expense
Total lease expense	$ 9.5	$ 8.8
Warehousing, Delivery, Selling, General, and Administrative [Member]
Lease Expense
Operating lease expense	6.0	5.6
Finance lease expense
Amortization of lease assets	1.6	1.6
Variable lease expense	0.8	0.7
Short-term lease expense	0.8	0.5
Interest and Other Expense on Debt [Member]
Finance lease expense
Interest on lease liabilities	$ 0.3	$ 0.4