Schedule II-Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Allowance for doubtful accounts
Changes in valuation and qualifying accounts
Balance At Beginning of Period	$ 14.2	$ 10.1	$ 10.6
Additions Charged To Expense	3.7	5.5	2.8
Additions Charged To Other Accounts	0.4	0.5
Deductions	(4.0)	(1.9)	(3.3)
Balance At End of Period	14.3	14.2	10.1
Reserve for excess and obsolete inventories
Changes in valuation and qualifying accounts
Balance At Beginning of Period	26.1	29.1	29.3
Additions Charged To Expense	7.3	7.0	11.8
Additions Charged To Other Accounts	1.5	0.6
Deductions	(9.5)	(10.6)	(12.0)
Balance At End of Period	$ 25.4	$ 26.1	$ 29.1