Basis of Presentation - Allowance for Credit Losses (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($)
Trade Receivables
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance December 31, 2019	$ 20.5
Credit Loss Expense for the period	4.3
Write offs During the Period	(1.2)
Ending Balance March 31, 2020	23.8
Trade Receivables | ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Additional Allowance Recognized Due to Adoption of Topic ASC326	0.2
Notes Receivables
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance December 31, 2019	0.1
Ending Balance March 31, 2020	0.1
Rebates from Vendors
Financing Receivable Allowance For Credit Losses [Line Items]
Credit Loss Expense for the period	0.1
Ending Balance March 31, 2020	0.2
Rebates from Vendors | ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Additional Allowance Recognized Due to Adoption of Topic ASC326	$ 0.1