Schedule II - Valuation And Qualifying Accounts (Details) - Allowance for doubtful accounts - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at January 1,	$ 1.1	$ 1.1	$ 1.9
Charged to Expense	0.1		(0.8)
Credited to Expense		0.5
Deductions		(0.5)	0.0
Balance at December 31,	$ 1.2	$ 1.1	$ 1.1