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Separation Costs and Activities Separation Costs and Acivities - Narrative (Details) - USD ($) shares in Millions, $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Restructuring Cost and Reserve [Line Items] |  |  |  |
Separation expense |  | $ 39.4 | $ 0.0 | $ 0.0
Restricted Stock |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Granted (in shares) |  | 0.4 | 0.0 | 0.1
Restricted Stock | Spinoff |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Granted (in shares) | 0.4 |  |  |
Anniversary period from grant date (in years) | 2 years |  |  |

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- Definition Costs associated with proposed separation + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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