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Goodwill and Other Intangible Assets (Weighted-Average Amortization Period) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted-average amortization period (in years) | 8 years | 8 years 1 month 6 days |
Amortization expense | $ 7.2 | $ 6.1 | $ 5.2
Customer Relationships [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted-average amortization period (in years) | 9 years 110 days | 9 years 3 months 18 days |
Trade Names [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted-average amortization period (in years) | 2 years 292 days | 2 years 10 months 24 days |
Developed Technology [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted-average amortization period (in years) | 6 years 110 days | 6 years 4 months 24 days |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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