For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
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-Section 50
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 275
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Section 50
-Paragraph 21
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- Definition

Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(3)
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount of contributions expected to be received by defined benefit plan from employer in fiscal year. Excludes contributions paid by employer in current fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
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Amount of cost for defined contribution plan.

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Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, long-term rate of return on assets	7.00%	7.00%	7.50%
Defined benefit plan, estimated future employer contribution in next fiscal year	$ 2.0
Defined contribution plan, compensation expense	$ 3.9	$ 3.5	$ 3.7
Defined Benefit Plan, Equity Investments by Sector Concentration Risk [Member] \| Equity Investment Portfolio, Total [Member] \| Technology Sector [Member]
Defined Benefit Plan Disclosure [Line Items]
Concentrations of risk	23.00%
Defined Benefit Plan, Equity Investments by Sector Concentration Risk [Member] \| Equity Investment Portfolio, Total [Member] \| Financial Services Sector [Member]
Defined Benefit Plan Disclosure [Line Items]
Concentrations of risk	18.00%
Defined Benefit Plan, Equity Investments by Sector Concentration Risk [Member] \| Equity Investment Portfolio, Total [Member] \| Consumer Cyclical Goods Sector [Member]
Defined Benefit Plan Disclosure [Line Items]
Concentrations of risk	13.00%
Defined Benefit Plan, Equity Investments by Sector Concentration Risk [Member] \| Equity Investment Portfolio, Total [Member] \| Healthcare Sector [Member]
Defined Benefit Plan Disclosure [Line Items]
Concentrations of risk	15.00%
Defined Benefit Plan, Equity Investments by Sector Concentration Risk [Member] \| Equity Investment Portfolio, Total [Member] \| Industrial Sector [Member]
Defined Benefit Plan Disclosure [Line Items]
Concentrations of risk	11.00%