SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Allowance for credit losses
Allowance for sales returns and doubtful accounts [Roll Forward]
Balance at Beginning of Period	$ 6.8	$ 6.6	$ 6.7
Charged to Expenses	1.2	1.0	0.7
Write-offs	(6.3)	(0.8)	(0.8)
Other	0.0	0.0	0.0
Balance at End of Period	1.7	6.8	6.6
Allowance for deferred tax assets
Allowance for sales returns and doubtful accounts [Roll Forward]
Balance at Beginning of Period	16.8	18.3	18.3
Charged to Expenses	(1.0)	(0.3)	(0.3)
Write-offs	(0.6)	0.0	0.0
Other	0.0	(1.2)	0.3
Balance at End of Period	$ 15.2	$ 16.8	$ 18.3