SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for sales returns and doubtful accounts [Roll Forward]
Reserves related to notes receivable and tax refund receivables	$ 5.6	$ 5.6	$ 5.6
Reserves related to non trade receivables			0.4
Allowance for doubtful accounts
Allowance for sales returns and doubtful accounts [Roll Forward]
Balance at Beginning of Period	1.0	1.1	9.1
Charged to Expenses	1.0	0.7	1.0
Write-offs	(0.8)	(0.8)	(9.0)
Other	0.0	0.0	0.0
Balance at End of Period	1.2	1.0	1.1
Allowance for sales returns(4)
Allowance for sales returns and doubtful accounts [Roll Forward]
Balance at Beginning of Period		1.4	1.4
Charged to Expenses			1.4
Write-offs			0.0
Other			(1.4)
Balance at End of Period			1.4
Allowance for inventory returns(5)
Allowance for sales returns and doubtful accounts [Roll Forward]
Balance at Beginning of Period		(0.5)	(0.6)
Charged to Expenses			(0.5)
Write-offs			0.0
Other			0.6
Balance at End of Period			(0.5)
Allowance for deferred tax assets
Allowance for sales returns and doubtful accounts [Roll Forward]
Balance at Beginning of Period	18.3	18.3	69.0
Charged to Expenses	(0.3)	(0.3)	(28.6)
Write-offs	0.0	0.0	(2.9)
Other	(1.2)	0.3	(19.2)
Balance at End of Period	$ 16.8	$ 18.3	$ 18.3