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Business Combinations - Hudson Intangible Assets Acquired (Details) - USD ($) $ in Millions |  | 3 Months Ended
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Sep. 20, 2017 | Mar. 31, 2018
Acquired Finite-Lived Intangible Assets |  |
Weighted-average Estimated Useful Life |  | 15 years
Customer relationships |  |
Acquired Finite-Lived Intangible Assets |  |
Weighted-average Estimated Useful Life |  | 14 years
Unpatented technology |  |
Acquired Finite-Lived Intangible Assets |  |
Weighted-average Estimated Useful Life |  | 12 years
Hudson |  |
Acquired Finite-Lived Intangible Assets |  |
Weighted-average Estimated Useful Life | 12 years |
Finite lived intangible assets acquired | $ 141.7 |
Identifiable intangible assets | 211.0 |
Hudson | Trademarks and trade names |  |
Acquired Finite-Lived Intangible Assets |  |
Indefinite-lived intangible assets acquired | $ 69.3 |
Hudson | Customer relationships |  |
Acquired Finite-Lived Intangible Assets |  |
Weighted-average Estimated Useful Life | 13 years |
Finite lived intangible assets acquired | $ 122.1 |
Hudson | Unpatented technology |  |
Acquired Finite-Lived Intangible Assets |  |
Weighted-average Estimated Useful Life | 10 years |
Finite lived intangible assets acquired | $ 18.3 |
Hudson | Customer backlog |  |
Acquired Finite-Lived Intangible Assets |  |
Weighted-average Estimated Useful Life | 2 years |
Finite lived intangible assets acquired | $ 1.3 |

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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 Amount of assets, excluding financial assets and goodwill, that lack physical substance, having a projected indefinite period of benefit, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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