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Summary of Significant Accounting Policies Revenue Recognition (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Allowance for Sales Returns [Member]
Valuation Allowances and Reserves, Balance	$ 28.4	$ 27.7
Allowance for Promotions [Member]
Valuation Allowances and Reserves, Balance	20.0	21.9
Allowance for Price Protection [Member]
Valuation Allowances and Reserves, Balance	$ 3.2	$ 1.5

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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

+ Details

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Period Type:	instant

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- Details

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- Details

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- Details

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