Schedule II-Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for doubtful accounts
Changes in valuation and qualifying accounts
Balance At Beginning of Period	$ 14.3	$ 14.2	$ 10.1
Additions Charged To Expense	3.3	3.7	5.5
Additions Charged To Other Accounts	(0.2)	0.4	0.5
Deductions	(2.4)	(4.0)	(1.9)
Balance At End of Period	15.0	14.3	14.2
Reserve for excess and obsolete inventories
Changes in valuation and qualifying accounts
Balance At Beginning of Period	25.4	26.1	29.1
Additions Charged To Expense	7.7	7.3	7.0
Additions Charged To Other Accounts	(0.7)	1.5	0.6
Deductions	(8.0)	(9.5)	(10.6)
Balance At End of Period	$ 24.4	$ 25.4	$ 26.1

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09)
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

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Amount of increase in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from charges to costs and expenses.

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- Definition

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Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively.

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