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Goodwill and Other Intangible Assets (Details 6) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Customer relationships |  |
Intangible assets |  |
Gross Balance | $ 673.9 | $ 494.6
Customer relationships | Estimated useful life 5-9 years |  |
Intangible assets |  |
Gross Balance | $ 25.5 | $ 27.1
Customer relationships | Estimated useful life 5-9 years | Minimum |  |
Intangible assets |  |
Estimated useful life | 5 years | 5 years
Customer relationships | Estimated useful life 5-9 years | Maximum |  |
Intangible assets |  |
Estimated useful life | 9 years | 9 years
Customer relationships | Estimated useful life 10-14 years |  |
Intangible assets |  |
Gross Balance | $ 72.3 | $ 72.3
Customer relationships | Estimated useful life 10-14 years | Minimum |  |
Intangible assets |  |
Estimated useful life | 10 years | 10 years
Customer relationships | Estimated useful life 10-14 years | Maximum |  |
Intangible assets |  |
Estimated useful life | 14 years | 14 years
Customer relationships | Estimated useful life 15-19 years |  |
Intangible assets |  |
Gross Balance | $ 468.4 | $ 287.5
Customer relationships | Estimated useful life 15-19 years | Minimum |  |
Intangible assets |  |
Estimated useful life | 15 years | 15 years
Customer relationships | Estimated useful life 15-19 years | Maximum |  |
Intangible assets |  |
Estimated useful life | 19 years | 19 years
Customer relationships | Estimated useful life 20-24 years |  |
Intangible assets |  |
Gross Balance | $ 107.7 | $ 107.7
Customer relationships | Estimated useful life 20-24 years | Minimum |  |
Intangible assets |  |
Estimated useful life | 20 years | 20 years
Customer relationships | Estimated useful life 20-24 years | Maximum |  |
Intangible assets |  |
Estimated useful life | 24 years | 24 years
Intellectual property | Weighted Average |  |
Intangible assets |  |
Estimated useful life | 8 years 7 months 6 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=26713463&loc=d3e16265-109275 + Details
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