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Corporate Office Relocation (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Restructuring Cost and Reserve [Line Items] |  |  |
Expected restructuring and relocation costs | $ 10.0 |  |
Home Office Relocation [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Employee severance, retention, relocation, and related costs | 4.4 | $ 16.3 | $ 15.4
Home Office Relocation [Member] | Employee severance, retention, and relocation costs [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Employee severance, retention, relocation, and related costs | 2.0 | 7.6 | 15.0
Home Office Relocation [Member] | Asset impairments [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Employee severance, retention, relocation, and related costs | $ 2.3 | $ 8.7 | $ 0.4

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