Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for doubtful accounts
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period		$ 3.3	$ 2.4	$ 6.3
Charged to costs and expenses		1.4	0.9
Deductions-describe	[1]			3.9
Balance at end of period		4.7	3.3	2.4
Allowance for uncollectible notes receivable
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period			0.2	0.4
Deductions-describe	[1]		0.2	0.2
Balance at end of period				0.2
Inventory valuation allowance
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period		159.2	144.0	134.9
Charged to costs and expenses		38.8	36.9	38.5
Charged to other accounts-describe	[2]		5.1
Deductions-describe	[3]	29.4	26.8	29.4
Balance at end of period		$ 168.6	$ 159.2	$ 144.0

[1] Write-off of uncollectible accounts and change in estimates

[2] Application of reserve policy to acquired inventories

[3] Sale of reserved inventory and divestitures