Recent Accounting Pronouncements (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Recent Accounting Pronouncements
Interest and other income (expense), net	$ (5.5)	$ (5.1)	$ (7.8)	$ (11.1)
Pension components included in interest and other income (expense) under new guidance	$ 1.3	1.8	$ 1.3	1.8
ASU 2017-07, Compensation-Retirement Benefits \| Reclassification for retrospective adoption
Recent Accounting Pronouncements
Cost of sales, selling, general and administrative, and research and development expense		(1.8)		(1.8)
Interest and other income (expense), net		$ 1.8		$ 1.8

The aggregate of cost of sales, selling, general and administrative expenses, and research and development expenses.

No definition available.

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- Definition

Amount of expense (reversal of expense) for net periodic benefit cost components, excluding service cost component, of defined benefit plan. Amount includes, but is not limited to, interest cost, expected (return) loss on plan asset, amortization of prior service cost (credit), amortization of (gain) loss, amortization of transition (asset) obligation, settlement (gain) loss, curtailment (gain) loss and certain termination benefits.

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.7)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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