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Corporate Office Relocation (Narrative) (Details) - Home Office Relocation [Member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Restructuring Cost and Reserve [Line Items] |  |  |
Employee severance, retention, relocation, and related costs | $ 8.3 | $ 4.4 | $ 16.3
Employee severance, retention, and relocation costs [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Employee severance, retention, relocation, and related costs | 1.0 | 2.0 | 7.6
Asset impairments [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Employee severance, retention, relocation, and related costs | $ 7.3 | $ 2.3 | $ 8.7

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- Definition Discloses the amount charged against the accrued restructuring reserves, or earnings if not previously accrued, during the period for the specified type of restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + 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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- Details
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