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Employee Benefit Plans (Pensions Plans with Benefit Obligation in Excess of Plan Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Pension plans with a benefit obligation in excess of plan assets: |  |
Projected benefit obligation | $ 394.4 | $ 370.2
Accumulated benefit obligation | 390.4 | 362.9
Fair value of plan assets | $ 305.9 | $ 280.8

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- Definition Amount of projected benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=77993564&loc=d3e4179-114921 + Details
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