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Intangible Assets Estimated future amortization of other intangible assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Summary of Other Intangible Assets [Abstract] |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] | The estimated annual amortization expense for other intangible assets for the next five years as of December 31, 2017 is listed below.
|  | 2018 |  | 2019 |  | 2020 |  | 2021 |  | 2022
Estimated amortization expense |  | $ | 23.3 |  |  | $ | 22.1 |  |  | $ | 20.4 |  |  | $ | 19.3 |  |  | $ | 16.4 |

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- Definition Summary of Other Intangible Assets [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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