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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Definite-Lived Intangible Assets [Roll Forward] |  |  |  |
Beginning Balance |  | $ 61.0 |  |
Amortization |  | (1.4) | $ (1.4) |
Ending Balance |  | 59.6 |  |
Accumulated Amortization |  | 16.2 |  | $ 14.8
Estimated Annual Amortization Expense for Definite-Lived Intangible Assets [Abstract] |  |  |  |
Remainder of 2018 |  | 4.0 |  |
2019 |  | 4.9 |  |
2020 |  | 4.7 |  |
2021 |  | 4.6 |  |
2022 |  | 4.3 |  |
Thereafter |  | 37.1 |  |
Intangible Assets [Abstract] |  |  |  |
Total Intangible Assets |  | 76.2 |  | $ 77.6
Total Intangible Assets, Amortization |  | $ (1.4) | $ (1.4) |
Weighted Average [Member] |  |  |  |
Definite-Lived Intangible Assets [Roll Forward] |  |  |  |
Remaining Useful Life (Years) |  | 18 years |  |
Trademarks and Trade Names [Member] |  |  |  |
Indefinite-Lived Intangible Assets [Roll Forward] |  |  |  |
Beginning Balance |  | $ 16.6 |  |
Ending Balance |  | 16.6 |  |
Customer Relationships [Member] |  |  |  |
Definite-Lived Intangible Assets [Roll Forward] |  |  |  |
Beginning Balance |  | 54.7 |  |
Amortization |  | (1.1) |  |
Ending Balance |  | $ 53.6 |  |
Remaining Useful Life (Years) |  | 20 years |  |
Intangible Assets [Abstract] |  |  |  |
Total Intangible Assets, Amortization |  | $ (1.1) |  |
Developed Technology and Other [Member] |  |  |  |
Definite-Lived Intangible Assets [Roll Forward] |  |  |  |
Beginning Balance | [1] | 6.3 |  |
Amortization | [1] | (0.3) |  |
Ending Balance | [1] | 6.0 |  |
Intangible Assets [Abstract] |  |  |  |
Total Intangible Assets, Amortization | [1] | $ (0.3) |  |
Developed Technology and Other [Member] | Minimum [Member] |  |  |  |
Definite-Lived Intangible Assets [Roll Forward] |  |  |  |
Remaining Useful Life (Years) |  | 1 year |  |
Developed Technology and Other [Member] | Maximum [Member] |  |  |  |
Definite-Lived Intangible Assets [Roll Forward] |  |  |  |
Remaining Useful Life (Years) |  | 11 years |  |
Developed Technology and Other [Member] | Weighted Average [Member] |  |  |  |
Definite-Lived Intangible Assets [Roll Forward] |  |  |  |
Remaining Useful Life (Years) |  | 7 years |  |
[1] | Developed Technology and Other includes patents, non-compete agreements, land easements and trade names with finite lives.

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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=98514028&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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