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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Definite-Lived Intangible Assets [Roll Forward] |  |  |  |  |  |
Beginning Balance |  |  |  | $ 65.6 |  |
Amortization |  | $ (1.4) | $ (1.2) | (2.8) | $ (2.5) |
Ending Balance |  | 62.8 |  | 62.8 |  |
Accumulated Amortization |  | 12.1 |  | 12.1 |  | $ 9.3
Estimated Annual Amortization Expense for Definite-Lived Intangible Assets [Abstract] |  |  |  |  |  |
Remainder of 2017 |  | 2.7 |  | 2.7 |  |
2018 |  | 5.1 |  | 5.1 |  |
2019 |  | 4.8 |  | 4.8 |  |
2020 |  | 4.5 |  | 4.5 |  |
2021 |  | 4.4 |  | 4.4 |  |
Thereafter |  | 41.3 |  | 41.3 |  |
Intangible Assets [Abstract] |  |  |  |  |  |
Total Intangible Assets |  | 79.4 |  | 79.4 |  | $ 82.2
Total Intangible Assets, Amortization |  | (1.4) | $ (1.2) | $ (2.8) | $ (2.5) |
Weighted Average [Member] |  |  |  |  |  |
Definite-Lived Intangible Assets [Roll Forward] |  |  |  |  |  |
Remaining Useful Life (Years) |  |  |  | 19 years |  |
Trademarks and Trade Names [Member] |  |  |  |  |  |
Indefinite-Lived Intangible Assets [Roll Forward] |  |  |  |  |  |
Beginning Balance |  |  |  | $ 16.6 |  |
Ending Balance |  | 16.6 |  | 16.6 |  |
Customer Relationships [Member] |  |  |  |  |  |
Definite-Lived Intangible Assets [Roll Forward] |  |  |  |  |  |
Beginning Balance |  |  |  | 59.3 |  |
Amortization |  |  |  | (2.3) |  |
Ending Balance |  | 57.0 |  | $ 57.0 |  |
Remaining Useful Life (Years) |  |  |  | 21 years |  |
Intangible Assets [Abstract] |  |  |  |  |  |
Total Intangible Assets, Amortization |  |  |  | $ (2.3) |  |
Developed Technology and Other [Member] |  |  |  |  |  |
Definite-Lived Intangible Assets [Roll Forward] |  |  |  |  |  |
Beginning Balance | [1] |  |  | 6.3 |  |
Amortization | [1] |  |  | (0.5) |  |
Ending Balance | [1] | $ 5.8 |  | 5.8 |  |
Intangible Assets [Abstract] |  |  |  |  |  |
Total Intangible Assets, Amortization | [1] |  |  | $ (0.5) |  |
Developed Technology and Other [Member] | Minimum [Member] |  |  |  |  |  |
Definite-Lived Intangible Assets [Roll Forward] |  |  |  |  |  |
Remaining Useful Life (Years) |  |  |  | 2 years |  |
Developed Technology and Other [Member] | Maximum [Member] |  |  |  |  |  |
Definite-Lived Intangible Assets [Roll Forward] |  |  |  |  |  |
Remaining Useful Life (Years) |  |  |  | 12 years |  |
Developed Technology and Other [Member] | Weighted Average [Member] |  |  |  |  |  |
Definite-Lived Intangible Assets [Roll Forward] |  |  |  |  |  |
Remaining Useful Life (Years) |  |  |  | 8 years |  |
[1] | Developed Technology and Other includes patents, non-compete agreements and land easements.

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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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