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Employee Benefit Plans - Change in Level 3 Plan Assets (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Change in fair value of the pension assets valued using significant unobservable inputs (Level 3) |  |
Fair value of plan assets at beginning of year | $ 99.3 | $ 104.5
Fair value of assets at end of year | 115.5 | 99.3
Level 3 |  |
Change in fair value of the pension assets valued using significant unobservable inputs (Level 3) |  |
Fair value of plan assets at beginning of year | 10.9 | 12.9
Unrealized gain (loss) on asset still held | (6.7) | (2.0)
Fair value of assets at end of year | $ 4.2 | $ 10.9

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- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets still held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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