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
Movement in valuation and qualifying accounts
Balance at Beginning of Year	$ 18.8	$ 15.5	$ 15.3
Additions Charged to Costs and Expenses	3.4	7.4	6.7
Deductions	4.4	4.4	6.5
Amounts Charged to Other Accounts		0.3
Balance at End of Year	$ 17.8	$ 18.8	$ 15.5