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Employee Benefit Plans - Reconciliation of the Fair Values Measurements of Plan Assets Using Significant Unobservable Inputs (Level 3) from the Beginning of the Year to the End of the Year (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Reconciliation of fair value measurements of plan assets using significant observable inputs |  |
Fair value of plan assets, beginning of year | $ 150.4 |
Fair value of plan assets, end of year | 161.3 | $ 150.4
Insurance Group Annuity Contracts |  |
Reconciliation of fair value measurements of plan assets using significant observable inputs |  |
Fair value of plan assets, beginning of year | 14.5 |
Fair value of plan assets, end of year | 14.4 | 14.5
Level 3 |  |
Reconciliation of fair value measurements of plan assets using significant observable inputs |  |
Fair value of plan assets, beginning of year | 14.5 |
Fair value of plan assets, end of year | 14.4 | 14.5
Level 3 | Insurance Group Annuity Contracts |  |
Reconciliation of fair value measurements of plan assets using significant observable inputs |  |
Fair value of plan assets, beginning of year | 14.5 | 106.5
Distribution of MFS |  | (89.9)
Actual return on plan assets |  | 2.0
Benefits paid | (1.5) | (1.4)
Currency translation adjustment | 1.3 | (2.7)
Fair value of plan assets, end of year | $ 14.4 | $ 14.5

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- Definition Defined benefit plan, plan assets, distribution from spin-off. + References No definition available. + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + 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)(1) -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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- Definition Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) plan assets of defined benefit plan. + 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)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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