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Supplemental Balance Sheet Information - Schedule of Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | $ 351.5 |  | $ 351.5 |  | $ 422.0
Accumulated Amortization | (217.7) |  | (217.7) |  | (278.8)
Net Carrying Amount | 133.8 |  | 133.8 |  | 143.2
Indefinite-lived intangible assets acquired |  |  | 5.7 |  | 5.7
Amortization expense for intangible assets | 4.7 | $ 5.1 | 9.2 | $ 10.4 |
Trademarks |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | 76.4 |  | 76.4 |  | 125.9
Accumulated Amortization | (50.0) |  | (50.0) |  | (97.6)
Net Carrying Amount | 26.4 |  | 26.4 |  | 28.3
Patents and acquired technologies |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | 237.1 |  | 237.1 |  | 253.0
Accumulated Amortization | (136.9) |  | (136.9) |  | (146.1)
Net Carrying Amount | 100.2 |  | 100.2 |  | 106.9
Other |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | 38.0 |  | 38.0 |  | 43.1
Accumulated Amortization | (30.8) |  | (30.8) |  | (35.1)
Net Carrying Amount | $ 7.2 |  | $ 7.2 |  | $ 8.0

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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