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Employee Benefit Plans Hudson Defined Benefit Plan (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Defined Benefit Plan, Benefit Obligation |  | $ 57.0 |  | $ 55.5 | $ 58.3
Defined Benefit Plan, Fair Value of Plan Assets |  | (48.5) |  | (41.1) | $ (41.0)
Defined Benefit Plan, Funded (Unfunded) Status of Plan |  | (8.5) | [1] | $ (14.4) |
Hudson [Member] |  |  |  |  |
Defined Benefit Plan, Benefit Obligation |  | 2.8 |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | (1.9) |  |  |
Defined Benefit Plan, Funded (Unfunded) Status of Plan | [1] | $ 0.9 |  |  |
[1] | (1) Accrued pension liabilities on the December 31, 2017 consolidated balance sheet includes $0.9 related to Hudson, which is not included in the table above.

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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for 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 (a) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + 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 funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status. + 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 (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919 + Details
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- Details
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