SCHEDULE II SCHEDULE OF VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Movement in valuation and qualifying accounts
Write-offs and Reclassifications			$ 0.0
Allowance for doubtful accounts
Movement in valuation and qualifying accounts
Balance at Beginning of Period	$ 0.8	$ 0.8	1.0
Charged to Costs and Expenses	0.5	0.1	0.2
Charged to Other Accounts	0.0	0.0	0.0
Write-offs and Reclassifications	(0.3)	(0.1)	(0.4)
Balance at End of Period	1.0	0.8	0.8
Allowance for sales discounts
Movement in valuation and qualifying accounts
Balance at Beginning of Period	0.5	0.5	0.5
Charged to Costs and Expenses	0.0	0.0	0.0
Charged to Other Accounts	(0.1)	0.0	0.0
Write-offs and Reclassifications	0.0	0.0
Balance at End of Period	0.4	0.5	0.5
Valuation allowance – deferred income taxes
Movement in valuation and qualifying accounts
Balance at Beginning of Period	2.7	0.4	3.5
Charged to Costs and Expenses	0.0	0.1	0.0
Charged to Other Accounts	3.1	2.2	0.0
Write-offs and Reclassifications	0.0	0.0	(3.1)
Balance at End of Period	$ 5.8	$ 2.7	$ 0.4