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Software, net - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Minimum |  |
Business Acquisition [Line Items] |  |
Estimated economic life | 2 years |
Maximum |  |
Business Acquisition [Line Items] |  |
Estimated economic life | 16 years |
Internal use software |  |
Business Acquisition [Line Items] |  |
Capitalized computer software, additions | $ 74.4 | $ 70.9
Internal use software | Minimum |  |
Business Acquisition [Line Items] |  |
Estimated economic life | 2 years |
Internal use software | Maximum |  |
Business Acquisition [Line Items] |  |
Estimated economic life | 10 years |
External use software | Minimum |  |
Business Acquisition [Line Items] |  |
Estimated economic life | 8 years |
External use software | Maximum |  |
Business Acquisition [Line Items] |  |
Estimated economic life | 10 years |
Regulatory approval costs | Minimum |  |
Business Acquisition [Line Items] |  |
Estimated economic life | 2 years |
Regulatory approval costs | Maximum |  |
Business Acquisition [Line Items] |  |
Estimated economic life | 4 years |

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- Definition Additions made to capitalized computer software costs during the period. + 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) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Details
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