Summary of Significant Accounting Policies, Other (Details) $ in Millions	12 Months Ended
Dec. 31, 2017 USD ($) segment item	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Summary of Significant Accounting Policies
Number of reporting units \| item	2
Number of reportable business segments \| segment	2
Goodwill impairment	$ 0.0	$ 0.0	$ 0.0
Impairment of intangible assets	$ 0.0	$ 0.0	$ 0.0
Revenue Recognition
Percentage of net sales attributable to broadband communication market (as a percent)	6.00%
Weighted-average assumptions:
Risk free interest rate (as a percent)	1.70%	1.30%	1.40%
Expected life	4 years 7 months 6 days	4 years 7 months 6 days	4 years 7 months 6 days
Expected volatility (as a percent)	13.00%	15.00%	17.00%
Expected dividend yield (as a percent)	1.00%	1.00%	1.00%
Income tax
Undistributed foreign earnings	$ 492.8
Research and Development
Research and development expenses for the creation of new and improved products and processes	$ 193.7	$ 166.1	$ 124.7

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of undistributed earnings of foreign subsidiaries intended to be permanently reinvested outside the country of domicile.

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