Schedule II (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year		$ 0.5
Balance at end of year			$ 0.5
Provision For Bad Debts [Member]
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	$ 1.4	0.7	0.3
Additions charged to earnings	0.4	0.9	0.7
Deductions	(0.8)	(0.2)	(0.3)
Balance at end of year	1.0	1.4	0.7
Provision For Discounts [Member]
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	1.3	1.4	1.3
Additions charged to earnings	21.7	19.4	21.0
Deductions	(21.3)	(19.5)	(20.9)
Balance at end of year	1.7	1.3	1.4
Provision For Warranties [Member]
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	0.9	0.2	0.4
Additions charged to earnings	3.9	5.5	3.0
Deductions	(4.0)	(4.8)	(3.2)
Balance at end of year	0.8	0.9	0.2
Provision For Inventory Obsolescence [Member]
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	0.0	0.5
Additions charged to earnings	0.3	0.1	0.6
Deductions	(0.1)	(0.6)	0.1
Balance at end of year	$ 0.2	$ 0.0	$ 0.5