Schedule II-Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounts Receivable Reserve Allowances
Changes in valuation and qualifying accounts
Balance At Beginning of Period	$ 14.3	$ 15.0	$ 14.3
Additions Charged To Expense	1.1	2.2	3.3
Additions Charged To Other Accounts	0.9		(0.2)
Deductions	(5.2)	(2.9)	(2.4)
Balance At End of Period	11.1	14.3	15.0
Reserve for excess and obsolete inventories
Changes in valuation and qualifying accounts
Balance At Beginning of Period	25.0	24.4	25.4
Additions Charged To Expense	13.3	6.6	7.7
Additions Charged To Other Accounts	1.4	(0.1)	(0.7)
Deductions	(6.3)	(5.9)	(8.0)
Balance At End of Period	$ 33.4	$ 25.0	$ 24.4